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1. bird watchers figured probably should scale my solution to the cloud Granted 5Mbit upload speed is decent but not If 100 people are trying to check out my backyard My simple solution was to replace the sleep command in the bird_update script with an scp command that uploads the bird jpg file to my Web hosting provider still try to be a good netizen and upload the actual Tile to the ramdisk on my provider s server but with the Jpg file being served from the cloud I m not worried about an influx of bird watchers If you Figure 6 Bird water just tastes better ai 58 OCTOBER 2013 WWW LINUXJOURNAL COM COLUMNS heated version and I ll be adding more suet and peanuts for the winter birds If you happen to be watching and see a cool bird don t hesitate to send me the photo had a visit from an Indigo Bunting one day that saw via BirdCam but that was when I was using an old iPhone so the image Is very poor quality BirdTopia attracts more than just birds THE OPEN SOURCE CLASSROOM making a MAME cabinet years ago There s just something about building with Linux that warms my heart m Shawn Powers Is the Associate Editor for Linux Journal He s also the Gadget Guy for LinuxJournal com and he has an interesting collection of vintage Garfield coffee mugs Don t let his silly hairdo fool you he s a pretty ordinary guy and can be reached via e mail at shawn linuxjournal com Or
2. U Boot Shell Load Kernel ELF Figure 1 Boot Sequence bootloader that is capable of loading the kernel and ramdisk image trom the NAND SD card USB drive and even the Ethernet via bootp DHCP and TFTP Timed out Execute bootcmd Figure 1 shows the default boot sequence of the BeagleBone Black This sequence is more or less applicable to most embedded systems The x loader and U Boot executables WWW LINUXJOURNAL COM OCTOBER 2013 93 FEATURE A Handy U Boot Trick Listing 2 The Serial Console Output from the Stage 2 Bootloader U Boot 2013 04 rc1 14237 2g90639fe dirty Apr 13 2013 13 57 11 12C ready DRAM 512 MiB WARNING Caches not enabled NAND No NAND device found 0 MiB MMC OMAP SD MMC 0 OMAP SD MMC 1 Warning readenv failed using default environment musb hdrc ConfigData Oxde UTMI 8 dyn FIFOs HB ISO Rx HB ISO Tx SoftConn musb hdrc MHDRC RTL version 2 0 musb hdrc setup fifo_mode 4 musb hdrc 28 31 max ep 16384 16384 memory USB Peripheral mode controller at 47401000 using PIO IRQ 0 musb hdrc ConfigData Oxde UTMI 8 dyn FIFOs HB ISO Rx HB ISO Tx SoftConn m sb hdrc MHDRC RIL version 2 0 musb hdrc setup fifo_mode 4 musb hdrc 28 31 max ep 16384 16384 memory USB Host mode controller at 47401800 using PIO IRQ 0 Net lt ethaddr gt not set Validating first E fuse MAC cpsw usb ether Hit any key to stop autoboot 6 are stored in the files called
3. You then can have one or more menu items with the items flush left with the title or right with the right side of the browser Here I ve chosen to align it to the right My menu items all go within a lt section gt tag with the class of top bar section and then an inner lt ul gt with a class of right indicating the alignment want and containing the menu items on the right side The result looks like this AT THE FORGE lt nav Class top bar gt lt ul class title area gt lt li class name gt lt h1 gt lt a href gt Test site lt a gt lt h1 gt lt 1i gt lt section class top bar section gt lt ul class right gt lt li class active gt lt a href 2 htm1l gt Page2 lt a gt lt 1i gt lt li class active gt lt a href 3 html gt Page3 lt a gt lt 1i gt lt li class active gt lt a href 4 htm1l gt Page4 lt a gt lt 1i gt lt ul gt lt section gt lt ul gt lt nav gt You can get even fancier if you want Put the entire lt nav gt element inside a lt div gt whose class is fixed and the navigation bar will stay at the top of the screen Finally your navigation bar may include drop down menus If for example you want the page4 link to be a menu add the has dropdown class to the lt li gt tag Then within the lt li gt add a new lt ul gt with a class of dropdown The inner lt li gt elements then will be treated as menu items
4. 20 coolant 2080 returned Getting Performance Data Those two cases listed above more than paid for the cost of a CA the Soliport adapter and the Figure 3 Torque s Virtual Instrument Panel 70 OCTOBER 2013 WWW LINUXJOURNAL COM Torque application but Torque can do so much more Torque can pull data from sources other than your OBD II sensors It also can poll your Android device s accelerometer and GPS This means it can do performance calculations such as 0 60 mph time or O 100 kph time 1 4 mile time or even horsepower calculations This requires that you get your car s data entered correctly into the vehicle profile during setup time particularly the vehicle weight including your weight as driver and any other stuff you may have inside the car If you do performance testing make sure you re doing it safely and don t violate any laws in your locality However think one of the coolest things that Torque and the Soliport adapter can do Is they can act as an auxiliary instrument panel for your car Any bit of information that passes through the OBD II sensors can be logged graphed or placed on a digital dial You can pick and choose how you want that information presented as well including the size and position of the graphs and dials This intormation can be extremely valuable for instance displaying the current engine manifold vacuum As a general rule under cruise conditions
5. EOBFBEA6 E8CD 11E2 BD96 D358A022FBO09 The doors to those things clouds are the QR codes I ve hung or stuck on them and in the case of the last one the item itself is a QR code There can be other doors as well for example URLs but QR codes are handy because a as with Ethernet the patent owners Denso in Japan decided they would rather create more value than they capture so they let anybody do anything they want with QR codes and b they re easy to scan with a smartphone Figure 1 Doc s 30 x 30 tablecloth looks like this QR code WWW LINUXJOURNAL COM OCTOBER 2013 115 EOF Until now QR codes have had the misfortune of being exploited mostly by marketers which is why they appear as robot barf on promotional jive all over the place But now It s time for the hackers to take over which is what the ones working for Kynetx have done They created a service http Awww windley com archives 2013 01 introducing_squaretag shtml called Squarelag https squaretag com which hosts things clouds Squarelag s business model for now is selling hang tags and stickers with QR codes on them I m using some of the tags and stickers for the things in the list above Note that Squarelag isn t a silo can take my things clouds plus my own personal cloud and put them wherever want That means can self host them put them in Dropbox or stick them in some other cloud service
6. For example lt li class has dropdown gt lt a href 4 html gt Page4 lt a gt lt ul class dropdown gt lt li gt lt a href 4 htmlL gt Page4a lt a gt lt 11 gt lt li gt lt a href 4 htmlL gt Page4b lt a gt lt 11 gt lt li gt lt a href 4 htmlL gt Page4c lt a gt lt 11 gt lt ul gt lt 11 gt WWW LINUXJOURNAL COM OCTOBER 2013 33 COLUMNS AT THE FORGE Not only will the above function as a nice top level menu but the Foundation CSS definitions also will place a down arrow hint next to the Page4 label showing the user that this is a menu rather than an individual menu option Conclusion It s easy to see why Zurb Foundation has become popular It offers many of the positional and navigational advantages of other CSS trameworks allows easy customization with SCSS although didn t demonstrate that in this column and perhaps best of all it allows you to design Resources your site simultaneously for large and small screens If you re designing an application that needs to work on mobile devices definitely would consider Zuro Foundation m Web developer trainer and consultant Reuven M Lerner is finishing his PhD in Learning Sciences at Northwestern University He lives in Modi in Israel with his wife and three children You can read more about him at http lerner co il or contact him at reuven lerner co il PEE Send comments or feedback via http www li
7. Foundation is smart enough to stack them vertically if the browser window Is too narrow You can see this for yourself by changing the width of your browser window with this page It gets even better Perhaps you want narrow browser windows such as those used on cell phones to continue displaying the columns side by side This is where Foundation s dual grid layout system shines Just as you can use large classes for large browser windows you can use small classes for small windows Foundation automatically will apply the appropriate class making it responsive in multiple ways This means that each div will look like this lt div class lLarge 6 small 3 columns gt Foundation also provides a number of button styles You can use these in forms or by themselves for actions that you ll then hook up with JavaScript callbacks A simple button can be given the button class lt input class button value Press me gt 32 OCTOBER 2013 WWW LINUXJOURNAL COM You can use classes to change the button s size tiny small medium or large color secondary alert or success or even rounded corners with a round class The documentation indicated that radius should work as well as round but it didn t operate correctly within my Chrome browser window You can combine these classes such as In lt input class button success large round value Press me gt Buttons in Foundation ha
8. Matte Color grey74 Dispose Undefined Iterations Compression JPEG Orientation Undefined JPEG Quality 94 JPEG Colorspace 2 JPEG SampLing factors 1x1 1x1 1x1 Signature bc8a6a698ca35fd8feab 1452423386ff9I8b1fb b5ec Profile xmp 811 bytes Profile exif 22 bytes unknown Profile app12 15 bytes Tainted False User Time 0 020u Elapsed Time 0 01 Truth be told dimensions and resolution are the most useful pieces of information trom this crazy long output With a tiny bit of effort you can extract just those items of information identify verbose pvp jpg grep E Resolution Geometry Geometry 970x311 Resolution 72x72 Now imagine you are working on a Web site and want to ensure that no images on the site are greater than 72dpi a standard screen resolution Higher print ready resolutions are rather pointless because a 300dpi image will render the same on a screen as its lower resolution 38 OCTOBER 2013 WWW LINUXJOURNAL COM brethren it ll just load slower Here s one way you can identity images in a directory with incorrect resolutions bin sh identi fy usr bin identify check images to ensure that they re all 72x72 resolution for filename do resolution identify verbose filename grep i Resolution grep v 72x72 if z resolution then echo Warning Image filename has resolution done exit 0 When I run this on a directory of ima
9. My last article described how to use Google Calendar from the command line and in this article talk about a more general cloud service RSS feeds It had written this column a few months ago it would have been more focused on replacing Google Reader itself because that was the primary RSS aggregator used but Google preemptively killed off the service and left a lot of users including myself scrambling to find a replacement Although a number of people were able to find some sort of Web based replacement realized the main features wanted sorting stories 42 OCTOBER 2013 WWW LINUXJOURNAL COM by date and vi key bindings to view the next story were absent in a lot of the existing Google Reader replacements What s worse a lot of people were using this as an opportunity to make a quick buck by selling access to RSS services and of course still capturing everyone s valuable Web viewing habits decided to take a completely different tack and convert my RSS feeds to e mail in a special mailbox and use an interface already was used to e mail on the command line using mutt decided to use the rss2email program written by the great Aaron Swartz to manage my feeds This software pulls down RSS feeds and converts each story into its own e mail message that it sends to you This means you can use whatever e mail program you want to read your feeds but of course because we are focusing on the command lin
10. Philip Jacob Jay Kruizenga David A Lane Steve Marquez Dave McAllister e Carson McDonald Craig Oda Jeffrey D Parent Charnell Pugsley e Thomas Quinlan Mike Roberts Kristin Shoemaker Chris D Stark Patrick Swartz e James Walker Advertising E MAIL ads linuxjournal com URL www linuxjournal com advertising PHONE 1 713 344 1956 ext 2 Subscriptions E MAIL subs linuxjournal com URL www linuxjournal com subscribe MAIL PO Box 980985 Houston TX 77098 USA LINUX is a registered trademark of Linus Torvalds Cau aoi v A En of STORAGE options TrueNAS has the tools to keep you afloat TrueNAS Unified Storage features the Intel Xeon Processor 5600 series and supports high availability remote replication deduplication encryption compression and snapshots It has the tools to deal with any storage challenge you may face 1X systems i gt aS my Intel the Intel logo and Xeon Inside are trademarks or registered trademarks of Intel Corporation in the U S and other countries eae ght ADRIFT inasea Key Features e Dual Intel Xeon Processors 5600 Series e Support for CIFS NFS iSCSI and more e Active Directory LDAP and NIS integration e Multi Petabyte Scalability intel inside Call iXsystems toll free or visit our website today 1 855 GREP 4 IX www iXsystems com Current_Issue tar gz Stealth Linux y favorite
11. but it also has a timer to remind you of parking meter timing Plus if your car has Bluetooth connectivity Valet will record where you left your car without any interaction on your part It just marks the location where Bluetooth disconnected and it happily guides you back when you ve finished spending your paycheck at Teavana in the mall LINGUA JOURNAL e Reader Customized Kindle and Nook editions now available LEARN MORE Maybe that s just me In fact Valet fills such a simple yet helpful purpose it s earned this month s Editors Choice award Its automatic tracking based on vehicle Bluetooth is really the feature that puts it over the top for me It s the best 0 99 I ve spent in a while You can find it at the Google Play store or check out the Web site http valetapp co SHAWN POWERS Make Utility Primer What s New in GNU Awk 4 0 Since 1994 The Original Magazine of the Linux Community ETEM 277 wwe inet e com WaveMaker for Rapid Application Development Modern Development DEVELOP GUIs with Qt4 Designer and Eclipse and Moose e Reader editions FREE for Subscribers MULTIPLATFORM DEVELOPMENT Using GNU Libraries and Tools USE GAUGER for Performance Regression Testing GETTING STARTED WITH jEDIT 5 Ji G R COLUMNS AT THE FORGE Zurb REUVEN M LERNER Foundation Designing a responsive Web site Zurb Foundat
12. com features and http wiki When you start Thuban you end openstreetmap org wiki Shapefiles up with a completely blank slate The files available on these sites Figure 1 The first step is to start will get you started with SHP files a new session which you can do by that contain at least basic features selecting the menu item File New for most of the world Session not much will change on the Thuban is not as flexible as full screen In order to start building your fledged GIS software and cannot map you need to add layers that can handle very many data Tile formats be manipulated started by selecting You can use SHP files DBF database the menu item Map Add Layer and files and various image Tile formats adding in an SHP Tile to give me the In the screenshots for this article basic geographic attributes for my Select one or more data files F B jbernard gt Downloads gt new brunswick Places Name v Size Modified amp Search Recently Used i bernard Desktop File System 10 GB Volume ES Documents B Music ES Pictures E Videos E Downloads buildings shp landuse shp E natural shp places shp points shp lal railways shp roads shp waterways shp 6 6 MB Yesterday at O07 2 1 MB Yesterday at 02 52 16 2 MB Yesterday at 07 43 2 kB Yesterday at 02 5 211 6 kB Yesterday at 02 491 4 kB Yesterday at 02 15 1 ME Yesterday at O72 2 1MB Yesterday at 02 Shape
13. http goo gl eoALA Ubuntu 12 10 Core Root Filesystem http goo gl iLcV8 Ubuntu 13 04 Core Root Filesystem http goo gl cytEY Qemu Source Code Download https launchpad net qemu linaro download WWW LINUXJOURNAL COM OCTOBER 2013 89 FEATURE A Handy U Boot Trick HANDY U BOOT TRICK Deploy and test new builds quickly with no more than rebooting the board BHARATH BHUSHAN LOHRAY 90 OCTOBER 2013 WWW LINUXJOURNAL COM mbedded developers working F on kernels or bare metal programs often go through several development cycles Each time the developer modifies the code the code has to be compiled the ELF Executable and Linkable Format kernel image has to be copied onto the SD card and the card then has to be transferred trom the PC to the development board and rebooted In my experience as a developer found the last two steps to be a major bottleneck Even copying Tiles to the fastest SD cards is Slower than copying files between hard drives and sometimes between computers across the network Moreover by frequently inserting and removing the SD card from the slot one incurs the risk of damaging the fragile connectors on the development boards Believe me lost a BeagleBoard by accidentally applying too much force while holding the board and pulling out the SD card The pressure caused the I C bus to fail Because the power management chip was controlled by I C nothing other than the se
14. metrics When you re done go back to the main screen Checking for Fault Codes Let s start by doing basic diagnostics on your car From the main screen select Fault Codes then press the large magnifying glass to start a scan of your car s computer for trouble codes If your Check Engine light is on you ll probably tind your issue represented as a code here My father s 2001 Chevy Silverado pickup was showing a Check Engine light and ran a quick scan on it with Torque It resulted in a trouble code of P1416 A quick Google search of that trouble code showed that it was the Secondary Air Valve Bank 2 It turned out that was a little smog system valve right on top of the engine on the passenger side Amazon com had that particular part for 37 and we had it at his house in two days had the Check Engine light on my wife s Durango pop on not long after and used the tool to scan her car Her car came back with a P0440 code WWW LINUXJOURNAL COM OCTOBER 2013 69 FEATURE Be a Mechanic with Android and Linux which means Evaporative Emission Control System Malfunction searched a bit more on the Internet and found that the most common cause of this code is a broken or mis installed fuel Tiller cap It turned out that was exactly the case her fuel filler cap wasn t tightened all the way tightened the cap and cleared the code via the Torque foo 3 fv A app and it never a 1
15. number associated with a feed to to dev null instead of sending you manage it For instance to get rid of a e mail every time For the most part feed numbered 12 you would type rss2email works as is but in my case wanted to change two extra settings r2e delete 12 To do this just open up rss2email contig py in a text editor and add the You also can pause feeds if you want following settings to ignore them temporarily with r2e pause number and then unpause it HTML_MAIL 1 with r2e unpause number DATE HEADER 1 Mutt as the Front End The first setting tells rss2email to What makes this set up work so well send the e mail as HTML mail and for me is that can use my regular the second dates the message based mail program mutt to view my on the date of the news story not feeds This means quickly can scan the date it picked it up Although my feeds and skip uninteresting you might be surprised that opt for or duplicate stories In my case HTML e mail in my text based e mail found needed to tweak how mutt client mutt automatically converts displays the index for this mailbox so HTML e mail to text for me Plus more easily could see who the feed 44 OCTOBER 2013 WWW LINUXJOURNAL COM Incident Management Proble Change Management Service Catalog Asset Management Project Management www servicedeskplus com demo servicedeskplus com COLUMNS Terminal greenfly snowball 18711 N A
16. s only because we do not yet have access to that data and therefore have not written applications to use It We don t know now what we ll do with that data any more than we could have looked at HTTP in 1983 and predicted Web 2 0 What we do know now though is that all the data is held by vendors and wherever it is that Personal Cloud can take us we can t get there from here Getting access to our own data is the first step Personal Cloud is Cloud 2 0 Strategies for Personal Cloud Development Twenty years from now we will know what the Personal Cloud equivalents of Google Wikipedia YouTube Facebook and Instagram are and they will seem obvious in hindsight But if you want to get started in Personal Cloud today where do 108 OCTOBER 2013 WWW LINUXJOURNAL COM you place your bets Although the specific implementations have yet to be revealed that s your job we do know some general directions with a high degree of confidence First and foremost among these is that the Personal Cloud wants to be invisible Once the user sets up the connection and preferences the fact that the apps are backed by a Personal Cloud Should not normally be evident to the user The exceptions exist mainly where the Personal Cloud provides enhanced functionality such as prompting the user for permission to release information Other than those exceptions all the user should see is the exposed functionality Some additional Per
17. similar take something that has been purely corporate in this case the cloud make it personal and then ramp it out to everything it might conceivably work on improving It along the way and not stopping The result if all goes according to plan is a true Internet of Things and the reframing of business around fully useful relationships between customers and companies or for that matter between anybody and anything m Doc Searls is Senior Editor of Linux Journal He is also a fellow with the Berkman Center for Internet and Society at Harvard University and the Center for Information Technology and Society at UC Santa Barbara TOUTE REAPER OO RORCOROD TORU OODUOROUUORUOREDTORUUTORUORER TORO Send comments or feedback via http www linuxjournal com contact or to ljeditor linuxjournal com Seattle needed a new grassroots Free Software summit so we created one Join speakers and participants from around the world for the inaugural Seattle GNU Linux Conference October 11th and 12th 2013 Seattle Central Community College campus Visit SeaGL org for more information Our mission is to educate train and evangelize Drupal within our geographic region T REGISTER Paid Cleactsdiilty lt a KEYNOTE SPEAKER DESIGNER SPECIALIZING i IN MOBILE DESIGN ad f i STRATEGY AND USER 7 i EXPERIENCE IAA Authored Best iPhone Apps Tapworthy Designing Great iPhone Apps d OR
18. swing by too While the occasional squirrel is brave enough to visit the most common non aviary visitor is Zoey Figure 6 wish you an awesome weekend project have enjoyed playing with BirdCam almost as much as enjoyed the linuxjournal IRC channel on Freenode net LECICIEEIECICCEIIELIOTCICELILECIETTEIEEITTE Send comments or feedback via or to ljeditor linuxjournal com If You Use Linux You Should Be noe UE E I V ll E a E N R ee T E ee 1008 gt BF an w ras aiiai OR 4 ND t Commmuseity ail A KAREI DED OM NO s uas tiR J iti Boot Q DURC CAR 2 1 wu Be 7 TECHN ve WITH ANDROID l EW CODE e TEST DS PUN y En SUBSCRIBE NOW AT Ri W with Aid ACER GI Book Be ae TRICK a for rv rol Anat station ves y WWWLUINUXJoURNAL COM SUBSCRIBE NVIDIA CUDA Version 5 5 is the latest and greatest iteration of NVIDIA CUDA NVIDIA s parallel computing platform and programming model that harnesses the power of GPUs NVIDIA CUDA 5 5 sayeth NVIDIA provides programmers with A a robust easy to use platform to develop advanced CU DA science engineering mobile and HPC applications on x86 CPU based systems and now on ARM based ones as well Beyond native support tor ARM platforms CUDA 5 5 delivers a number of new advanced performance and productivity features including enhanced Hyper Q support MPI workload prioritization and new gui
19. window setInterval refreshImage 1 2500 gt lt center gt lt img style width 100 max width 2048px msrc http example com birds jpg id cam gt lt Dr gt lt small lt em gt This should constantly refresh lt em lt small gt EME lt body gt lt html gt sure the image was actually fetched head The key part of the script is from my server every couple seconds the JavaScript code which defines an proved challenging Listing 3 shows action for an image with a specific my final HTML file ID You can see the ID is cam in A large part of the top of the file the JavaScript and in the img tag shown in Listing 3 is just defining below The peculiar part of the script the specific HTML standards in use is the bit of random info after the l II be honest most of it is over my photo URL That s actually the part 56 OCTOBER 2013 WWW LINUXJOURNAL COM COLUMNS THE OPEN SOURCE CLASSROOM of the script that not only reloads 2500 milliseconds as the refresh time the image every 2 5 seconds but because it seems to work from most also loads the image with a rand RANDOMNUMBER DAA R WEL 3 08 PM at the end That s basically me tooling the browser into thinking there is a new image to download every time so don t get shown a cached image There are several ways to do such a thing but this proved to be the simplest and most cross browser friendly in my testing There is concern of filling up
20. ESSID wpa psk YOUR PASSPHRASE Next if you want your bash shell to have autocompletion edit etc bash bashrc and uncomment some of the lines to be something like the following Commented out don t overwrite xterm T title n icontitle by default If this is an xterm set the title to user host dir case TERM in xterm rxvt PROMPT_COMMAND echo ne 033 0 USER HOSTNAME PWD 007 ge esac enable bash completion in interactive shells if f etc bash_ completion amp amp shopt oq posix then etc bash_completion Check etc shadow for the following root 15629 0 99999 7 daemon 15629 0 99999 7 If you see an asterisk after the first colon on the line for root you should remove It This will allow you to set the root password yourself on the first run You have completed the process of building the root filesystem for your board Next let s compress the entire root filesystem so you can deploy it easily to your MicroSD card later Exit the chroot environment and do the following inside your root filesystem directory umount proc rm usr bin qemu arm static tar zcvf home user my rootfs tar gz Preparing the MicroSD Card am using a 4GB MicroSD card for my board am sure that a 2GB MicroSD card would be sufficient to contain all your files but it is nice to have some room for additional applications You need to create two
21. FAQ http www denx de wiki DULG Faq and U Boot Manual Listing 8 An Example of uEnv txt for TFTP Booting optargs quiet uenvemdx echo Booting the bone from emmc http www denx de wiki DULG Manual The various commands in the uenvcmd variable must be on the same line separated by a semicolon You may notice that place my script in uenvcmdx instead of uenvcmd This is because test n throws an error to the console based on the content of the variable it is testing Certain variable contents especially long complicated scripts cause the test n to fail with an error message to the console Therefore put a simple command to run uenvcemdx in uenvcmd If you find that your script from the uEnv txt is not being executed look for an error on the serial console like this test minimal test Like bin sh Usage test args env set ipaddr 192 168 146 10 env set serverip 192 168 146 1 tftpboot kloadaddr BI bootfile tftpboot fdtaddr w BI fdtfile setenv bootargs console console S optargs root mmcroot rootfstype mmcrootfstype moptargs quiet bootm kloadaddr uenvcmd run uenvcmdx fdtaddr WWW LINUXJOURNAL COM OCTOBER 2013 101 FEATURE A Handy U Boot Trick On some development boards like the BeagleBoard xM http beagleboard org Products BeagleBoard xM the Ethernet port is implemented on the USB bus Therefore it is necessary to start the USB s
22. Il be reading the fine print on the Google solution before installing though that s for sure Shawn Powers WRITE LJ A LETTER We love hearing from our readers Please send us your comments and feedback via http www linuxjournal com contact PHOTO OF THE MONTH Remember send your Linux related photos to ljeditor linuxjournal com an 7 f as e s Vo A oN s A i _ y A 4 y A ii w 4 J 0 U i N A B ia 4 a n ell 5 SUBSCRIPTIONS Linux Journal i in a variety of digital formats incl epub mobi and an on line d as well as apps for iOS and An Renewing your subscription ct e mail address for issue deliver invoice viewing your account subscription inquiries can be d on line http www linuxjour E mail us at subs linuxjournal com rt us via postal mail at Linux Journ 980985 Houston TX 77098 USA remember to include your co and address when contacting us ACCESSING THE DIGITAL AR Your monthly download notific will have links to the various for and to the digital archive digital archive at any time http www linuxjournal com LETTERS TO THE EDITOR We w letters and encourage you ti at http www linuxjournal mail them to Linux Journal Houston TX 77098 USA Lette edited for space and clarity WRITING FOR US We always are for contributed articles tutori real world stories for the An author s guide a list o due dates can be found on l http www linuxjo
23. MLO and shown in Listings 1 3 The x loader uboot img respectively These files are is responsible for the output shown stored in a FAT32 partition The serial in Listing 1 Once the execution is port outputs of the BeagleBone are handed over to U Boot it offers you 94 OCTOBER 2013 WWW LINUXJOURNAL COM Listing 3 The Serial Console Output from the Stage 2 Bootloader and Kernel gpio pin 53 gpio 53 value is 1 Card did not respond to voltage select gpio pin 54 gpio 54 value is 1 SD MMC found on device 1 reading uEnv txt 58 bytes read in 4 ms 13 7 KiB s Loaded environment from uEnv txt Importing environment from mmc Running uenvcmd Booting the bone from emmc apio pin 55 i0 55 value is il 4215264 bytes read in 778 ms 5 2 MiB s adio Pin 56 eplel 56 value is i 22780 bytes read in 40 ms 555 7 KiB s Booting from mmc Booting kernel from Legacy Image at 80007fcO Image Name Angstrom 3 8 6 beaglebone Image Type ARM Linux Kernel Image uncompressed Data Size 4215200 Bytes 4 MiB Load Address 80008000 Entry Point 80008000 Verifying Checksum OK Flattened Device Tree blob at 80f80000 a few seconds to interrupt the boot sequence as shown in Listing 2 It you choose not to interrupt U Boot executes an environment variable Booting using the fdt blob at 0x80f80000 XIP Kernel Image OK OK Using Device Tree in place at 80f80000 end 80f888fb Starting kernel
24. Se bys ws Ef w y wt S J n A N TF L z I TQ uy S r hE NA Wi va Te i ULL E Ad j bi AE PowerShell Fundamentals by Steven anioo e _ Murawski Stack Exchange m Paper presentations workshops vendo Introduction to Chef by Nathen Harvey exhibition posters Guru Is In sessions Opscode BoFs and more New for 2013 The LISA Lab Hack Space Register by October 15 and save Additional discounts are available www usenix org lisa2013 NN nat Aa f ie Mee AANOYWNIIA ayilh ANA SPO te b on Ri gt ASSOCIATION Wu CODAU uv n WUN UT OR ns VU e Ke u senix FEATURE Create a Mini PC or Server with Olimex s Olinuxino A13 A13Micro Create a Mini PC or Server with Olimex s Olinuxino A13 A13Micro STEP BY STEP INSTRUCTIONS ON HOW TO CREATE A PERSONAL COMPUTER OR EVEN A SMALL SERVER WITH THIS GREAT EMBEDDED SYSTEM FOR LESS THAN 80 US RONALD KURNIAWAN limex is a Bulgarian company known for its Innovative hobbyist products It has a wide array of microcontroller based products ranging from the small Arduino clones to the very able system that has the Allwinner A13 microcontroller as its brain In this article describe how you can create a working Linux system for the Olinuxino A13 and Olinuxino A13Micro from scratch Let s begin by obtaining and compiling the kernel creating the U Boot system preparing the root filesystem and ge
25. Shawn Powers is the Associate Editor for Linux Journal He s also the Gadget Guy for LinuxJournal com and he has an interesting collection of vintage Garfield coffee mugs Don t let his silly hairdo fool you he s a pretty ordinary guy and can be reached via e mail at shawn linuxjournal com Or swing by the linuxjournal IRC channel on Freenode net WWW LINUXJOURNAL COM OCTOBER 2013 9 CURRENT _ISSUE TAR GZ letters Compojure Sublime Text R GNU Awk 4 1 Tizen DNSSEC SPONSORED BY PROGRAMMING DATA ANALYSIS WITH R i b s b o i E s a 5 i g E 4 E b EDIT CODE LIKE A PRO WHAT S NEW A NEW MOBILE FOR WEB OPTIMIZED OS DEVELOPMENT FOR YOUR OWN ZONE Net Connectivity in Hotels In Doc Searls article Dear Hotels Quit Being A holes in the August 2013 issue he writes In the US and Europe the expensive hotels are the ones with inconvenient connectivity deals It s the cheap hotels that offer free Internet just like they offer free electricity heat air conditioning and running water I ve recently stayed in youth hostels in northern Italy and in Alberta Canada They all had free Wi Fi Why would anyone stay In an expensive hotel And I m a youth of 66 most youth hostels seem to have no age limit David Brown 10 OCTOBER 2013 WWW LINUXJOURNAL COM Doc Searls replies Coincidentally am a youth of 66 as well So let s toast st
26. Uncompressing Linux done booting the kernel 0 106033 pinctrl single 44e10800 pinmux prop pinctrl 0 index 0 invalid phandle 9 638448 net ethO phy 4a101000 mdio 01 not found on slave 1 The Angstrom Distribution beaglebone tty00 Angstrom V2012 12 Kernel 3 676 beaglebone login called bootcmd bootcmd holds the search sequence for a file called uImage This is the kernel image The kernel image is loaded into the WWW LINUXJOURNAL COM OCTOBER 2013 95 FEATURE A Handy U Boot Trick Listing 4 Well Formatted Content of the Variable bootcmd Ol gpio set 53 02 i2c mw 0x24 1 0x3ej 03 run mndi dt 04 mmc dev Q 05 if mmc rescan 06 then 07 echo micro SD card found 08 setenv mmcdev 0 Os Gils 10 echo No micro SD card found setting mmcdev to 1 11 setenv mmcdev 1 on 13 setenv bootpart mmcdev 2 14 mmc dev mmcdev 15 if mmc rescan 16 then 17 gpio set 54 18 echo SD MMC found on device mmcdev 19 it r n Toadbooteny 20 then 21 echo Loaded environment from bootenv 22 run importbootenv 23 fi 24 if test n uenvcmd 25 then 26 echo Running uenvcmd g 27 run uenvycmd 28 fis 29 gpio set 55 30 if run loaduimage oul then a gpio set 56 33 run hoadidt 34 run mmcboot 35 i Biome 96 OCTOBER 2013 WWW LINUXJOURNAL COM memory and the execution finally is transferred to the kernel as shown In Listing 3 The search sequence defined
27. allow you to work with Individual elements from an SHP file The first is an information tool that pops up a detail window for any element you select The second is a label tool When you select an element a dialog window pops up allowing you to select one of the properties to be displayed as a label Once you have a map you re happy with you probably will want to save it for later use Because Thuban works with sessions all of your work in generating the map will be Saved as a session within Thuban as long as you remember to save It by clicking the menu item File Save Session But this doesn t help much if you want to use your map outside Thuban There is an option to export a map as an SVG Tile by using the menu item Extensions Write SVG Map This is not the most efficient output available however My simple example here blew up to more than 50MB for a single map with two layers The other option is to print your map Although you can print to actual paper for a hard copy you also can print to a file using the generic PostScript printer This generates a PostScript file that will be a bit more manageable You also can convert this PostScript file to other formats with relative ease So to get a PDF of your map you can print to a PostScript file and then convert it to PDF with the ps2pdf utility Now you have a map that you can share with friends and tamily JOEY BERNARD t UPFRONT My home is nota place it is
28. and Amateur Radio issue enjoyed the January 2010 issue P S enjoy the articles in Linux Journal keep up the good work Miicheal Trombley The archive CDs are an all or nothing sort of thing The intention isn t to resell the same thing every year but rather to provide a full archive for those folks hoping to catch up They re also nice for people like me who like to collect the whole set but don t think there are any plans to release incremental updates That said subscribers have LETTERS access to the back issues maybe that helps Shawn Powers Google Reader saw Shawn Powers article on Google Reader via the Linux Journal RSS teed The Google Giveth in the May 2013 issue Go to http keepamericaatwork com decided to do this when Google 7 Panel PC e ARMS 400Mhz Fanless Processor Upto 1GB Flash amp 256 MB RAM 7 800 x 480 TFT LED Backlit LCD EMATE n Analog Resistive Touchscreen e 10 100 Base T Ethernet 3 RS232 amp 1 RS232 422 485 Port e 1 USB 2 0 High Speed Host port 1 USB2 0 High Speed OTGIpont e 2 Micro SD Flash Card Sockets SPI amp 12C ports 12S Audio Interface w Line in out Operating Voltage of 12 to 26 Vdc yp Optional 2D Accelerated Video amp Decoder Pricing start at 550 for Qty 1 2 6 KERNEL Designed and Manufactured in the USA the PPC E7 Compact Panel PC comes ready to run with the Operating System install
29. and a vendor inquiring of that cloud How much money do you make How old are you What is your address If that cloud is owned by a credit bureau or data broker the responses will be the actual values There is no default assumption of privacy You have no say in how much data about you these commercial entities hold whether it is accurate or with whom they share it The entire business model of data brokers is to provide answers for questions to which if you had been asked in person you would have responded by saying that s personal The impersonal cloud also hoards your data preventing you from deriving any benefit from it If you participate in a grocery loyalty program somewhere out there Is a database containing line item records all your purchases That s a rather intimate level of detail about you and your immediate household If someone on the street asked you detailed questions about some of WWW LINUXJOURNAL COM OCTOBER 2013 107 _ INDEPTH those line items you undoubtedly would say that s personal If that Same person then offered to pay you a dollar for details of which personal hygiene products you use and how often you buy them it would seem creepy But that is exactly the kind of information we give out in exchange for a dollar off of a jug of milk I ve been told that the average person has no use for grocery line item data If that is true and don t believe that it is it
30. any of the board s GPIO pins make sure that you select An ugly sun4 gpio driver option under Device Drivers and Misc devices viper moblinux OLINUXINO al3micro sunxi 3 4 Power management options Arrow keys navigate the menu lt Enter gt selects submenus gt Highlighted letters are hotkeys Pressing lt Y gt includes lt N gt excludes lt M gt modularizes features Press lt Esc gt lt Esc gt to exit lt gt for Help lt gt for Search Legend built in excluded lt M gt module lt gt M Suspend to RAM and standby Run time PM core functionality Log time spent in suspend lt Exit gt lt Help gt Figure 2 Uncheck Suspend to RAM and Standby viper moblinux OLINUXINO als3micro sunxi 3 4 Device Drivers Arrow keys navigate the menu lt Enter gt selects submenus gt Highlighted letters are hotkeys Pressing lt Y gt includes lt N gt excludes lt M gt modularizes features Press lt Esc gt lt Esc gt to exit lt gt for Help lt gt for Search Legend built in excluded lt M gt module lt gt Generic Driver Options gt Connector unified userspace lt gt kernelspace Linker Memory Technology Device MTD support gt Parallel port support gt Block devices gt Misc devices gt SCSI device support gt lt gt Serial ATA and Parallel ATA drivers gt Multiple devices driver support RAID and LVM g
31. bird_getphoto sleepi done Listing 2 bird_getphoto Script bin bash Variables change to fit your needs ORIGINAL_PHOTO dev shm birdtemp jpg MODIFIED_PHOTO dev shm birdmod jpg FINISH _PHOTO dev shm birds jpg CAMERA_IP 192 168 1 201 PROTOTUR E nttp 192 168 i201 5000 pPh0to pE if eval ping c 1 CAMERA_IP gt dev null then usr bin wget r timeout 10 quiet 0 ORIGINAL_PHOTO PVE HOMO URC convert ORIGINAL PHOTO quality 70 pointsize 64 fill white annotate 675 60 date 1 M S p tMODIFIED PHOTO rm ORIGINAL_PHOTO mv MODIFIED PHOTO FINISH_PHOTO fi 54 OCTOBER 2013 WWW LINUXJOURNAL COM ended up making a few scripts one of which launch via rc local on system boot Listings 1 and 2 The first script bird_update Listing 1 Is Started via rc local on my server could have called the larger script directly from rc local and had it loop but this way could make a change to the main script bird_getphoto Listing 2 and not worry about restarting the rc local stuff bird_update runs bird_getphoto sleeps for a second and starts over That means if make a change to bird_getphoto the changes would be reflected on the next iteration of the loop with nothing to Start over Since tweaked bird_getphoto about 6 000 times this method was ideal The bird_getphoto is what does the dirty work so to speak Stepping through the commands s
32. higher manifold vacuum means higher fuel economy so having this gauge up can be handy on long trips Torque also has other features like the ability to log your data for future analysis It also can graph that data and correlate it to your GPS position and accelerometer data This can be useful if you happen to be an amateur racer and would like to get information about your car s performance at certain points on the racetrack Most people won t need that ability but it s nice to know that the developer of Torque thought that out All the data necessary to do those LinuxJournal com the White Paper Library www linuxjournal com whitepapers WWW LINUXJOURNAL COM OCTOBER 2013 71 FEATURE Be a Mechanic with Android and Linux calculations is there it just needs to be glued together Closing Computer control systems in cars used to be mysterious overly complicated finicky pieces of technological voodoo to even the most seasoned mechanic Scan tools were proprietary and cost thousands of dollars and mechanics needed a special tool for each car manufacturer With the advent of OBD II and inexpensive computers It s now easy to de mystity and diagnose your car Don t let the strange terms Resources Soliport ELM327 Bluetooth OBD II Scanner fool you like the computers you re already familiar with an automobile is just a collection of technology and machinery and you can troubleshoot it just like a
33. in the bootcmd variable and the filename ulmage are hard coded in the U Boot source code see Listing 9 Listing 4 shows the formatted content of the environment variable bootcmd The interesting parts of bootcmd are U Boot shell At the shell you can see a list of supported commands by typing help or You can list all defined environment variables with the env print command These environment variables are a powerful tool for scripting To resume the boot sequence you either can issue the boot command or run bootcmd A good way to understand what the The uEnv txt file is a method for users to Insert scripts into the environment lines 19 28 This part of the script checks for the existence of a file called uEnv txt If the file is found the Tile is loaded into the memory line 19 Then it is imported to the environment ready to be read or executed line 22 After this the script checks to see if the variable uenvcmd Is defined line 24 If it is defined the script in the variable is executed The uEnv txt file is a method for users to insert scripts into the environment Here we ll use this to override the default search sequence and load the kernel image or an ELF tile from the TFTP server For better insight into the workings of U Boot recommend interrupting the execution and dropping to the bootcmd is doing is to execute each command one at a time from the U Boot shell and see its effect You may replac
34. it doesn t quite Layer Properties natural Layer Type polygon Projection None Classification t UPFRONT Figure 4 Each layer has a properties window where you can control how the data gets displayed Field type y Data Type Text Visible Default Symbol Value _ E _ Ty look right you always can click the Revert button to undo the changes and try something else Although every map begins with a single layer it is very rare that a single layer is enough to show all the details you may want to have displayed In this example don t have any roads on my map A separate SHP file is available that has this intormation however So clicked on the menu item Map Add Layer and added the Tile roads shp Opening up the properties dialog shows that this particular SHP Tile Label Revet OK j Add _Move Down _ Edit Symbol Remove Close paenan man has several different attributes to play with For now I selected four different road types and highlighted them with four different colors There is still a default color for any road types other than the four selected To make them go away on the map you can select the default property and simply make it transparent Then only the four selected road types will show up Now the map is starting to look a bit more interesting and I need to start worrying about what order the layers are in WWW LINUXJOURNAL COM
35. lt Esc gt lt Esc gt to exit lt gt for Help lt gt for Search Legend built in excluded lt M gt module lt gt Bus support gt Kernel Features gt Boot options gt CPU Power Management gt Floating point emulation gt Userspace binary formats gt Power management options gt Networkinc Device Drivers gt File systems gt v lt Exit gt Figure 5 Networking Support Option 80 OCTOBER 2013 WWW LINUXJOURNAL COM viper moblinux OLINUXINO al3micro sunxi 3 4 Networking options Arrow keys navigate the menu Highlighted letters are hotkeys lt M gt modularizes features for Search Legend built in Packet socket Unix domain sockets gt gt gt gt PF KEY sockets d TCP IP networking IP multicasting IP advanced router Y i l IP tunneling IP GRE demultiplexer A Y lt h tt lt Exit gt lt Enter gt selects submenus gt Pressing lt Y gt includes lt N gt excludes Press lt Esc gt lt Esc gt to exit lt gt for Help lt gt excluded lt M gt module lt gt Transformation user configuration interface IP kernel Level autoconfiguration lt Help gt Figure 6 Make sure that TCP IP networking is selected also plan to use Olimex s MOD WIFI USB Stick Module that adds the Wi Fi capabilities to the board To do that you need to inc
36. manage all this information for you Mint com aggregates all your financial accounts into a single view but probably won t be adding your WWW LINUXJOURNAL COM OCTOBER 2013 109 INDEPTH health records power and grocery loyalty information any time soon nor would you want it to If Mint com began asking for your health and grocery data you probably would tell it that s personal The Personal Cloud version of an aggregator operates more like FileThis com FileThis periodically fetches your bank statements e bills and purchase receipts then loads them into a data store that you control It never stores the information it collects on your behalf nor does it attempt to provide any analysis or presentation of that data You supply the credentials and the storage it Supplies the integration Apart from a few early examples this field is wide open Every loyalty program interactive heath service government hosted citizen database social media service utility provider identity provider bookmark sync service contact list or other service that holds your information is a candidate either to aggregate that data into a single view or pull it into the individual s Personal Cloud If those services hope to remain competitive they will recognize the value in empowering Individuals to access their own data and begin to cooperate with integrators and publish APIs Hosted apps and plugins hosting 110 OCT
37. root filesystem from the Debian project or Ubuntu as both distributions provide armht binaries for the essential applications explain how to prepare both options next Preparing the Filesystem Debian Wheezy Start by creating a new directory for your root filesystem For the sake of clarity call mine debian rootts You ll use an application called debootstrap to 82 OCTOBER 2013 WWW LINUXJOURNAL COM pull the basic filesystem structure from a Debian repository You are free to use a repository that is closer to you rather than the same one use in this example Enter the following as root or using sudo inside your newly created directory debootstrap foreign arch armhf wheezy home user A13System debian rootfs http ftp debian org debian Note that the resulting structure is still not a complete filesystem The next step is to create a chroot system within your new directory For those of you who are not familiar with chroot this command effectively creates an isolated system within your host system cp which gemu arm static home user A13System debian rootfs usr bin mount t proc proc home user A13System debian rootfs proc chroot home user debian rootfs bin bash I have no name debootstrap debootstrap second stage Copy the qemu arm static binary into your root Tilesystem s usr bin directory The qemu arm static binary helps run the armhf binaries from yo
38. s usr bin directory configure prefix home user A13System gemu arm static Static disable kvm target list arm 1linux user make make install Finishing Touches for the Root Filesystem What you have so far Is just a very basic filesystem Now let s improve it so that you have the tools required for a comfortable basic computing environment Change the locales generated according to your own locale All the processes described next are done inside the 84 OCTOBER 2013 WWW LINUXJOURNAL COM chroot system root host apt get update root host apt get install apt utils ncurses dev root host apt get install dialog locales tzdata root host locale gen en_AU en _AU UTF 8 root host dpkg reconfigure locales root host dpkg reconfigure tzdata root host apt get install iputils ping wpasupplicant dhcpcd5 sudo openssh server ntp openssh client root host apt get install nano vim gettext bison automake autoconf root host apt get install python rsyslog network manager alsa utils Now let s configure Wi Fi connectivity I m assuming that you re using a Wi Fi USB adapter for your connectivity and that your wireless network connection configuration is using WPA for security Change the steps accordingly for your configuration Edit your etc network interfaces and add the following lines changing the values as needed auto wlanQ 1face wlan0 inet dhcp wpa ssid YOUR
39. sunxi git Let s compile U Boot first Depending on the target system A13 or A13Micro go to the U Boot directory and issue the following command make al3 olinuxino CROSS COMPILE arm linux gnueabihf Or make al3 olinuxinom CROSS COMPILE arm linux gnueabihf Note the dash at the end of the commands are not typos After the make process finishes if everything goes correctly you should end up with u boot bin and spl sunxi spl bin Go to the kernel source directory Check the configuration directory S KERNEL_DIR arch arm configs for the A13 configuration file a13_defcontig or A13Micro al130m_detcontig If you do not have the configuration file for A13Micro which is usually the case you can find the download URL in the Resources section Now you need to check the configuration file for a specific line learned the hard way that without this line the compilation will fail Add the following line to your configuration file if it does not exist or uncomment It CONFIG _GPIOLIB y Once again depending on the target system issue one of these sets of commands to compile the kernel source make ARCH arm a13 defconfig make menuconfig Or make ARCH arm a13om defconfig make menuconfig WWW LINUXJOURNAL COM OCTOBER 2013 77 FEATURE Create a Mini PC or Server with Olimex s Olinuxino A13 A13Micro viper moblinux OLINUXINO al3micro sunxi 3 4 Linuxfarm 3 4 43 Kernel Con
40. to be as full featured as with using a Web based client but it s a lot more flexible Plus in my case often have hundreds of stories to pore through so viewing just the text versions of stories helps me focus on what s most important the data m Kyle Rankin is a Sr Systems Administrator in the San Francisco Bay Area and the author of a number of books including The Official Ubuntu Server Book Knoppix Hacks and Ubuntu Hacks He is currently the president of the North Bay Linux Users Group LECICIIEIECICICIUELTOTCICULIIICICLTIIEITTE Send comments or feedback via http www linuxjournal com contact or to ljeditor linuxjournal com Big Data TechCon Discover how to master Big Data from real world practitioners instructors who work in the trenches and can teach you from real world experience Come to Big Data TechCon to learn the best ways to Collect sort and store massive quantities Learn HOW TO integrate data collection of structured and unstructured data technologies with analysis and business analysis tools to produce the kind of workable information and reports your organization needs Understand HOW TO leverage Big Data to help your organization today BigData TECHCON Process real time data pouring into your organization Master Big Data tools and technologies like Hadoop Map Reduce NoSQL databases and more Doug Cutting Founder of 7A oX g Hadoop TF y Big Data TechCon is gr
41. version 4 of the Foundation framework and although it is not as popular as Bootstrap the people who are using it seem to be quite passionate about its advantages Foundation Basics If you aren t yet familiar with CSS frameworks the idea is pretty straightforward When you want to lay out a Web application you likely COLUMNS will want some headlines some text some sidebars a menu and all sorts of other design elements You could design the entirety of the layout classes and CSS trom scratch each time Or you could use predetined styles designed to work with all sites with a great deal of flexibility Each modern CSS framework functions in this same way You put text Into divs and give each div a class indicating how many columns across it should be up to the maximum number of columns defined by the framework Foundation offers 12 columns meaning that you can lay out your design in one very wide column two equally sized columns 6 6 or even something wilder such as 3 4 5 Foundation like other modern frameworks goes way beyond just providing you with a nice grid It also gives you control over navigation elements and forms and even gives you some JavaScript based elements for displaying images and dialog boxes The bulk of Foundation is implemented using SCSS a modern implementation of SASS SCSS is a superset of CSS that can be compiled using an open source tool into regular CSS files However y
42. 04 The Personal Cloud Engine Management Diagnostics and Tools What happens when you take all the functionality of enterprise commercial software and make it available to individuals We re about to find out EA T Rob Reame 26 Reuven M Lerner s At the Forge Adapter Zurb Foundation i l Status 36 Dave Taylor s Work the Shell Image Manipulation oS with ImageMagick mines Graphing EJ Test 42 Kyle Rankin s Hack and Results Command Line Cloud rss2email 48 Shawn Powers The Open Source Classroom It s a Bird It s Another Bird 114 Doc Searls EOF The First Personal Platform for Everything 8 Current Issue tar gz 10 Letters 14 UPFRONT 24 Editors Choice 60 New Products 117 Advertisers Index LINUX JOURNAL ISSN 1075 3583 is published monthly by Belltown Media Inc 2121 Sage Road Ste 395 Houston TX 77056 USA Subscription rate is 29 50 year Subscriptions start with the next issue WWW LINUXJOURNAL COM OCTOBER 2013 5 JOURNAL Subscribe to Linux Journal Digital Edition for only 2 45 an issue Mabe UDI U Ane JOURNAL DEVELOP Gils 1 O14 Design MULTIPLAIFORM OCVELOPMENT ENJOY Timely delivery Off line reading Easy navigation Phrase search and highlighting Ability to save clip and share articles Embedded videos Android amp iOS apps desktop and e Reader versions SUBSCRIBE TODAY JOURNAL Executive Editor Jill Frankl
43. Boot script that will fetch the kernel image and boot it I m going to present two ways of doing this using DHCP and using only TFTP As 100 OCTOBER 2013 WWW LINUXJOURNAL COM mentioned before running a poorly contigured DHCP server will cause a network wide disruption of services However if you know what you are doing and have prior experience with setting up network services this is the simplest way to boot the board A DHCP boot can be initiated simply by adding or modifying the uenvcmd variable in the uEnv txt file as shown in Listing 6 uEnv txt is found in the FAT32 partition of the BeagleBone Black This partition is available to be mounted when the BeagleBone Black is connected to your computer via USB cable For a TFTP only boot you manually specify an IP address for the development board and the TFTP server This is a much safer process and you incur very little risk of interfering with other users on the network As in the case of configuring to boot with DHCP you must modity the uenvcmd variable in the uEnv txt Tile The script shown in Listing 7 is an example of how to set up your BeagleBone Black to get a kernel image trom the TFTP server and pass on the execution to it Both Listing 6 and 7 are formatted to give a clear understanding of the process The actual uEnv txt file should look something like the script shown in Listing 8 For more information about U Boot scripting refer to the U Boot
44. Control Your Own Data with the Personal Cloud se ug Since 1994 The Original Magazine of the Linux Community OCTOBER 2013 ISSUE 234 www1inuxjournal com EMBEDDED DIAGNOSE YOUR CAR WITH ANDROID TEST NEW BUILDS QUICKLY WITH A U BOOT TRICK BUILD A PERSONAL COMPUTER CNO lt K GA OR SERVER IM M WITH AN EMBEDDED SYSTEM Shell Scripts and ImageMagick Design a Responsive Web Site i J ern Th Set Up Your A Simple Approach Own BirdCam for Viewing RSS Feeds Attend the Largest Dedicated Android Conference in the Universe Registration Now Open SSS ONG SO SAN FRANCISCO November 12 15 2013 Get the best real world Android developer training anywhere e Choose from more than 75 classes and tutorials e Network with speakers and other Android developers e Check out more than 40 exhibiting companies AnDevCon is a great opportunity to take your Android skills to the next level get exposed to technologies you haven t touched yet and network with some of the best Android developers in the world Joe Mitchell Software Engineer Quicken Loans It s a blast learning and exchanging ideas with phenomenal speakers and cutting edge experts who have the experience Brad Holmes Software Developer uShip AnDevCon is a trademark of BZ Media LLC Android is a trademark of Google Inc Google s Android Robot
45. Foundation proudly calls its new LibreOffice 4 1 office suite not only the best but also the most interoperable free office suite ever The 4 1 milestone release features a large number of improvements in the area of document compatibility which increases the opportunities of sharing knowledge with users of proprietary software while retaining the original layout and contents Numerous improvements have been made to Microsoft OOXML import and export filters as well as to legacy Microsoft Office and RTF Tile filters Other new interoperability focused features include font embedding in Writer Calc Impress and Draw and import and export functions new in Excel 2013 tor ODF OpenFormula compatibility http www libreoffice org MWR InfoSecurity s drozer my The Android security testing framework E e E formerly known as Mercury and now called drozer was released recently by MWR InfoSecurity With drozer companies using Android mobile devices now can sateguard their assets and IT infrastructure by running Tull dynamic security assessments A new drozer feature is the ability to compromise Android devices through publicly available exploits something that helps organizations understand how a technical vulnerability on a mobile device can become a real threat to their business Drozer unifies these publicly available exploits into a single framework and improves the quality of the exploitation code and payloads available to t
46. HTML5 features and use alternatives for all of the aspects of Foundation if the feature doesn t exist You can Moreover this is the result of use Modernizr in your application translating the SCSS source into CSS if you wish but it s loaded here so expressed as SCSS the Tile is much that Foundation can handle different shorter and easier to understand browser versions 2 After loading the Foundation 3 Next you load the JavaScript CSS file you then load Modernizr for Foundation But here things Listing 1 Hello world DOCTYPE html lt html gt lt head gt sticle Minimal Zr be FoundatTon mle tithe lt link rel stylesheet href S55 foundation css gt lt script src js vendor custom modernizr js gt lt script gt lt head gt lt body gt lt hl Hello world headline lt hil gt lt p gt Hello world paragraph lt p gt lt SCHipt document write lt script src CPO T a 1s Vendor Zepto s7 Vendor queny t is lt Serio 4 lt script lt script src js foundation min S gt lt script gt lt script gt document foundation SCIP lt body gt lt html gt 28 OCTOBER 2013 WWW LINUXJOURNAL COM COLUMNS get a bit more interesting Rather than a lt script gt tag that loads a JavaScript library Foundation allows you to use either jQuery or Zepto a lightweight library that copies many of j Query s most popular features Foundation tests at runtime whether th
47. If you are feeling adventurous you always can try to debootstrap your Ubuntu root filesystem just like described in the previous section You also can find instructions on the Internet for that Here let s opt for an easier way and just download a ready made minimal root filesystem provided by Ubuntu Several packages are available including Ubuntu 12 04 12 10 and 13 04 Make sure that you are downloading the armhf version of the root filesystem package Create a directory for your Ubuntu root filesystem and extract the contents of the file you just downloaded into it Your next move should be to edit etc resolv cont and add your nameserver in there Also take a look at your sources list Tile in etc apt You might want to add universe and multiverse at the end of each deb and deb src line WWW LINUXJOURNAL COM OCTOBER 2013 83 FEATURE Create a Mini PC or Server with Olimex s Olinuxino A13 A13Micro You should check the version number of your gemu arm static Version 1 0 50 that comes with Standard install of Ubuntu 12 04 generates errors when running the following steps on my build system for the Ubuntu root filesystem To solve the problem had to compile my own gemu arm static used version 1 0 91 see Resources for the download URL of the source package Do the following steps to contigure and compile the binary and copy the resulting qgemu arm to qemu arm static inside your Ubuntu root Tilesystem
48. OBER 2013 WWW LINUXJOURNAL COM providers cannot process your data if they cannot see it If you are to get any value out of the data you choose to keep private you will need something that you control to correlate analyze and visualize it One approach exemplified by OwnCloud is a framework made up of database hosting a plugin architecture and APIs Out of the box the system supplies cloud storage calendaring contact lists music streaming and on line photo galleries But the real power Is in the plugin architecture and APIs For example there is no personal health vault in the basic version of OwnCloud but that easily could be added Alternatively some Personal Cloud applications will run standalone Consider the FileThis service mentioned previously Among the other accounts to which it integrates it can download your bank statements But this requires you to give it your on line banking credentials which is a bit problematic That issue would go away if you could run its application locally The Standalone app model provides all the benefits of the vendor s integration know how without exposing your banking account credentials Retro fit There are a lot of dumb appliances out there with plenty of useful lite in them Similarly there are very few existing houses wired for data or that have their own Personal Cloud servers If we imagine a future world where all those devices are smart how do we get fr
49. OCTOBER 2013 21 t UPFRONT Figure 9 Using the Generate Class button is a shortcut to get you started Tithe natural Layer Type polygon Projection None Classification Field type Data Type Text Visible Default Singleton Thuban will draw layers in the order they appear in the legend list Starting at the bottom and working its way up You can move a particular layer up our down by selecting it and then using the buttons at the top of the legend pane Another type of layer you can use is an Image layer Obviously the image needs to be geo referenced in some way Thuban supports the geoTlFF file format If you place your image at the bottom of the layer list you then can draw on top of it with the data in the SHP files 22 OCTOBER 2013 WWW LINUXJOURNAL COM Layer Properties natural Value Label fe OSS DEFAULT ss forest i park E Symbol Move Down To manipulate the map itself Thuban uses a sort of mode system To zoom in you need to select the zoom button Then you either can use click and drag to select a region to zoom in on or simply click a spot on the map to re center and zoom in Once you have zoomed in you can use the pan tool to move the view window around the map to highlight different regions There are buttons to zoom you to specific scales such that the entire map is visible This always takes you back to the default map view Two tools
50. Through a feature called sate and mine you can present a message to any Samaritan who scans the QR code of a thing you ve lost For example This bag belongs to your name Text me at your number From any computing device you can write or change that message But here s the biggest thing Every thing s cloud is a platform for relationship between you as the owner and whoever else you welcome aboard notably the companies that make and sell the things you ve bought 116 OCTOBER 2013 WWW LINUXJOURNAL COM For example have messages waiting for the makers of many of the items above Here are a few E Canon I m in the market for a 5D Mark Ill when the price for a new one falls below 2500 E LaCrosse l Il be glad to testify my love for the charger in any promo you want to run It s the best charger I ve ever used The display also tends to flicker and fade Is there an easy fix for that Mm Sangean Gave the radio a 5 star review on Amazon but I won t buy another one like it unless it does HD too E Garmin Love the sensitivity and the Ul What I want are more than 10 000 waypoints in memory and the ability to produce KML files E Dish Network DishAnywhere is a great system That s mostly how watch the VIP 922 What I d like is to have access to all the menu items remotely through the browser UIl and on the tablet app Please notify me when that feature is ready Thank
51. Torque an excellent app that not only can collect all the OBD II stats but also graph and log them in myriad ways There s also a free version Torque Figure 1 Tools of the Trade a Nexus 7 Tablet anda Lite that has a fair deal of Soliport Bluetooth OBD II Scanner the functionality of the Tull 66 OCTOBER 2013 WWW LINUXJOURNAL COM Although it s possible to use a laptop to do the same duty as an Android device it s a little more involved as the Bluetooth protocol stack on a Linux laptop requires some more massaging than simply pairing up an Android device However if you re comfortable with the command line and Bluetooth commands like rfcomm it s absolutely possible and there are some good OBD II packages like pyobd and openobd You won t get some of Torque s value add features like accelerometer and GPS integration but you still can use the laptop for diagnostic purposes and data logging In the December 2008 issue of LJ wrote an article called Hacking the Nokia Internet Tablet and talked about ways to hack and extend the Nokia N800 tablet It turns out there s an application for the N800 and N810 called Carman that was designed to work with wired OBD II adapters but it works just fine with the Soliport Bluetooth Scanner Carman used to be in the Maemo repositories no longer have a working N800 so can t check that now but when my N800 did work used it a few times to diagnose the car So i
52. XJOURNAL COM OBD II port isn t powered until the car s ignition is on Make sure your garage door is open please don t want to receive hate mail from your relatives on how you suffocated trom carbon monoxide poisoning Next you need to go through the standard Bluetooth pairing process to pair your Android device to the Soliport adapter The pairing code is 1234 if you can t find it in the instructions coincidentally it s the same combination that s on my luggage Once you ve got your Android device all paired up to the Soliport you re ready to fire up Torque Start Torque on your Android device and you ll be greeted with the Torque main screen Setting Up Torque Now that you have Torque up select the little settings slider on the bottom left of the screen and select OBD2 Adapter Settings Set the connection type as Bluetooth and choose the Soliport if prompted Go back to the main settings screen and select your desired units Imperial or Metric and any other preferences you choose then flip back to the Torque main screen Next you re going to create a orotile tor your vehicle Select the settings slider from the main screen as before then select Vehicle Profile and Create new profile Then fill in the pertinent information about your vehicle This information is used by Torque to compute things that can be calculated like horsepower fuel economy and other
53. ade and cover My family refers to the area outside my office window as BirdTopia Figure 1 And they haven t even seen the heated bird bath and peanut feeders have planned for winter So what does my obsession with bird watching have to do with Linux Well obsession demands that either stare out my window all day and lose my job or figure out some way to watch my birds while staring at a computer screen Enter BirdCam needed a way to stream a live video feed of BirdTopia without spending any more money The not spend money part was implied by my wite The Camera Because don t share an office with anyone my camera options didn t have to be pretty considered a USB Webcam but all the Webcams have are really low quality Thankfully have a drawer full of old cell phones that have been replaced with newer models had three iPhone 3GS handsets and a Samsung Galaxy S2 with a cracked screen The iPhones seemed to be in better shape so first tried to use one of them purchased a 5 application called iWebcamera which turns an iOS device into an IP camera with a built in Web server Unfortunately the iPhone 3GS has a pretty cruddy camera so although the application worked well wasn t satisfied Next up was my Galaxy S2 phone with the cracked screen Obviously the crack didn t matter and the camera is much nicer Also the Google Play store has an app called IP Webcam that is c
54. aying young for the duration clink As I said mostly stay in private homes all with free Internet connections when I m paying my own way And like AirBnB But the youth hostel idea is also a good one and even cheaper Thanks Cerberus In the August 2013 issue Shawn Powers recommended the Cerberusapp application to track the location of your Android phone see his UpFront piece titled Android Candy Hire a Cerberus to Find Your Phone This is indeed a great app thanks for sharing However you should be aware of the privacy policy https www cerberusapp com privacy php LSDroid uses your personally identifiable location intformation to create new features promotions functionality and services LSDroid uses cookies and log file information to b provide custom and personalized content advertisements and information c monitor the effectiveness of our marketing campaigns LSDroid discloses aggregate anonymous log file and usage information in reports to interested third parties just thought you and LJ readers should be aware of the privacy implications when using the app Aviv Ugh Thanks for pointing that out Creepy indeed Shawn Powers Archive CD already own the 1994 2009 Linux Journal Archive CD Is there a way to just download purchase the issues from 2010 onward or do have to purchase another archive disk Also do you plan to have another Linux
55. be able to read and serve them over the network You can test your server by placing a file there and attempting to get it using the tftp client tftp 192 168 146 1 c get uImage COMMAND Some common problems you may face include errors due to permission Make sure that the files are readable by the tftp user or whichever user the WWW LINUXJOURNAL COM OCTOBER 2013 99 FEATURE A Handy U Boot Trick Listing 6 An Example of the uenvcmd Variable for DHCP Booting echo Booting the BeagleBone Black from LAN DHCP dhcp kloadaddr tftpboot fdtaddr BI fdtf ile setenv bootargs console console optargs root mmcroot rootfstype mmcrootfstype optargs quiet bootm kloadaddr fdtaddr Listing 7 An Example of uenvcmd Variable for TFTP Booting echo Booting the BeagleBone Black from LAN TFTP env set ipaddr 192 163 146 10 env set serverip 192 168 146 1 tftpboot kloadaddr BI bootfile tftpboot fdtaddr BI fdtfile setenv bootargs console console optargs root mmcroot rootfstype mmcrootfstype optargs quiet bootm kloadaddr fdtaddr tftod runs as Additionally directories must have execute permission or tftp will not be able to descend and read the content of that directory and you ll see a Permission denied error when you attempt to get the Tile U Boot Scripting Now that you have your DHCP and TFTP servers working let s write a U
56. boot your embedded device trom an SD card a USB stick or even over TFTP U Boot can make modifications as simple as a device reboot Bharath walks through the process and gives configuration examples And finally T Rob talks about the future of the Cloud specitically the Personal Cloud While the fluid size and burstable expansion of cloud computing has revolutionized the way we think about server rooms It also has moved sensitive data out of our personal control How do we deal I with managing our personal private data in a world focusing on selling services T Rob explores that and gives us a lot to consider Much like cloud computing embedded computing has a fairly flexible definition One thing is certain however and that is that Linux is perfect for the embedded world however you define it With its breathtaking variety of hardware Support and unassuming happiness living behind the scenes the embedded market may be the vehicle Linux finally uses to take over the world Year of the desktop Pshaw more like year of the everything else with a little desktop on the side Although Linux may not have the marketing campaign or ad campaigns of the proprietary alternatives much like Mr Miyagi it doesn t need it Just do the job do it well and the rest will fall into place We hope you enjoy this issue very likely reading it on your embedded device we certainly enjoyed putting it together m
57. butes that you choose to keep private As a sovereign person they are all considered private It is your choice whether to reveal your income age weight or any other piece of 104 OCTOBER 2013 WWW LINUXJOURNAL COM personal information The ubiquity of the phrase that s personal speaks to a broadly shared understanding that we get to choose what information about ourselves we reveal and to whom we reveal it Cloud There is no industry standard definition of the term cloud but we should at least all be able to agree on a few attributes Many of these are optional depending on who you talk to but the one essential element of the cloud is abstraction An observer sees the cloud as a single logical thing with which to interact and need not be concerned with the individual elements that make up the cloud In addition a cloud will have one or more of the following elements E Elasticity computing resources can be allocated dynamically to match variable load E Redundancy the use of multiple physical servers increases the availability of the cloud service E Resiliency the cloud service can survive interruption or loss of some physical components without loss of function E Runtime resolution resource identities and addresses are resolved dynamically E Ubiquity some clouds are public while others are private However they are scoped a cloud service is expected to be accessible from all poi
58. caches or buffers on the server but so far haven t experienced any issues The End Or Is It To fulfill my personal needs the bash scripts and the bit of JavaScript really did all needed can view the BirdCam from multiple computers in my house and even trom the Internet Each video frame is around 600K so although it still uses significant bandwidth it s nothing like trying to stream Tull video have noticed that with slow cellular connections sometimes the image freezes because it tries Figure 5 With the ability to view BirdCam to refresh before the original remotely can get some great shots even image is loaded settled on when I m not home WWW LINUXJOURNAL COM OCTOBER 2013 57 COLUMNS THE OPEN SOURCE CLASSROOM locations Figure 5 were worried about saturating my home If you visit my BirdCam now connection fear not planned ahead http birds brainofshawn com you ll probably notice I ve done a little Winter Is Coming more tweaking I ve added a query If you set up a similar Webcam d love to the local weather station and to hear about it You re also welcome to added the current temperature to the watch the exploits of my bird obsession annotation The big change however as winter approaches The bubbling is one you hopefully shouldn t notice bird bath soon will be replaced with a Because knew I d be sending this to tens of ol thousands of potential
59. class Large 6 columns gt lt h1l gt Hello world headline lt h1 gt lt p gt Hello world paragraph And even more hello world And even even more more hello world And so on and so forth And again And even more hello world And even even more more hello world And so on and so forth lt p gt lt div gt lt div gt COLUMNS And if you want both paragraphs of text under the same headline you can do that as well lt div class row gt lt h1i gt Hello world from a long headline lt h1 gt lt div class Large 6 columns gt lt p gt Hello world paragraph And even more hello world And even even more more hello world And so on and so forth And again And even more hello world And even even more more hello world And so on and so forth lt p gt lt div gt lt div class Large 6 columns gt lt p gt Hello world paragraph And even more hello world Powerful Rhino Rhino M4700 M6700 e Dell Precision M4700 M6700 w Core i7 Quad 8 core e 15 6 17 3 FHD LED w X 1920x1080 e NVidia Quadro K5000M e 750 GB 1 TB hard drive e Up to 32 GB RAM 1866 MHz e DVD RW or Blu ray e 802 11a b g n e Starts at 1375 e E6230 E6330 E6430 E6530 also available e High performance NVidia 3 D on an FHD RGB LED e High performance Core i7 Quad CPUs 32 GB RAM e Ultimate configurability choose your laptop s features e One year Linux tech support phone and email e Three year manufa
60. computer E Bill Childers is an IT Manager in Silicon Valley where he lives with his wife and two children He enjoys Linux far too much and probably should get more sun from time to time OUT P UREA UR POOR OOTORORUOTORORUOUORORURUORERORUORORORUDUOR Send comments or feedback via http www linuxjournal com contact or to ljeditor linuxjournal com http www amazon com Soliport Bluetooth OBDII Diagnostic Scanner dp BOO4KLOI9I Torque Android OBD II Scanner App https play google com store apps details id org prowl torque amp hl en Torque Lite FREE Android OBD II Scanner App https play google com store apps details id org prowl torquefree amp hl en OBD II Trouble Code Lookup http www obd codes com trouble_codes PyOBD Home Page http www obdtester com pyobd OpenOBD Home Page http sourceforge net apps mediawiki openobd index php title OpenOBD Carman on the Nokia N800 http tabletblog com 2007 02 carman bluetooth elmscan 5 and n800 html 72 OCTOBER 2013 WWW LINUXJOURNAL COM NOVEMBER 3 8 2013 WASHINGTON D C S 7 E j j S A 1 3 27th Large Installation System Administration Conference Keynote Address Modern Infrastructure The Convergence of Network Compute and Data by Jason Hoffman a Ph as hi a J r i a i 6 Eff y A E ma A Nr A hea ag lassroom NON ADSt s f E Jh tana a r a nA Q J an on ae EATI f aTa ar NAYES r i yU 0 U Voc WEEE
61. cturer s on site warranty e Choice of pre installed Linux distribution O GELOOP EmperorLinux where Linux amp laptops converge AT THE FORGE And even even more more hello world And so on and so forth And again And even more hello world And even even more more hello world And so on and so Torti lt p lt div gt lt div gt Now could you have accomplished this on your own Of course But everyone who ever has worked with CSS knows it can be difficult to get this right Moreover what happens when someone wants to browse this site with a smartphone or a small browser window Zurb Foundation is Tablet Raven Raven X230 X230 Tablet e ThinkPad X230 X230 tablet by Lenovo e 12 5 HD LED w X 1366x768 e 2 6 2 9 GHz Core i7 e Up to 16 GB RAM e 750 GB hard drive 180 GB SSD e Pen finger input to screen rotation e Starts at 1920 e W530 T430 T530 X1 also available Rugged Tarantula Tarantula CF 31 e Panasonic Toughbook CF 31 e Fully rugged MIL SPEC 810G tested drops dust moisture amp more e 13 1 XGA TouchScreen e 2 4 2 8 GHz Core i5 e Up to 16 GB RAM e 320 750 GB hard drive 512 GB SSD e CF 19 CF 52 CF H2 also available www EmperorLinux com 1 888 651 6686 Model specifications and availability may vary COLUMNS AT THE FORGE responsive meaning that it adjusts automatically This means that although you might have defined your paragraphs to be side by side
62. d they provide the framework in which the data owner sets policies that express the relationship between the data and any third parties authorized to access it If it is a cloud architecture respects the owner s privacy and the owner is the ultimate authority over authorization WWW LINUXJOURNAL COM OCTOBER 2013 105 _ INDEPTH decisions it is a Personal Cloud Not a Buzzword Much of the buzz about cloud computing is just that buzz But Personal Cloud is more There Is a parallel here with the way we purchase motive power In San Francisco halfway down the hill on Mason Street there are giant motors transferring motive power to cables which in turn run below the street to distribute that motive power along the cable car routes When the cable Car requires motive power it gets It directly from the cable Many years ago factories worked the same way Large motors distributed motive power to belts and pulleys that distributed it throughout the factory But that method didn t scale very well There is no tap trom your house to an underground cable that provides power tor washers and dryers refrigerators and so on Nor is there a giant motor in the back yard and a system of pulleys and belts running from it to the house Instead we self host hundreds of tiny motors invisibly built in to disk drives DVD players appliances clocks and almost everything capable of movement The magic of this is that we don t th
63. d in which you can program behaviors based on interactions of devices and events in your life The cloud also has access to all your transaction and demographic data location and preferences Now combine these in the most far fetched way that you can think of Here s an example My smart house would have individually addressable path lighting throughout My dog would have an NFC or Bluetooth beacon on his collar so that the house could know exactly where he is would then program a behavior causing the path lighting to follow him around the house Once he got used to that would train him that following the path lighting cues would lead to a reward The last step would be to create a phone app I ll call it Fetch that leads the dog from wherever he is in the house to WWW LINUXJOURNAL COM OCTOBER 2013 111 INDEPTH wherever am admit this is a very stupid cloud trick criticized vendors for moving wall switches to phone apps and just did the same thing with the dog The point is that if you own the data and your devices talk first to you instead of the vendor you are not constrained by the vendor s choice of integrations and can invent weird and wonderful behaviors for your stuff But you have to admit that a phone app that remotely controls the dog is kinda cool So let s try something a bit more practical Your power company has a rate plan that lets it shut off your water heater and air condit
64. d them please visit the Personal Data Ecosystem INDEPTH Consortium Project VRM and the Respect Network E T Rob spent the last 20 years working on security clustering high availability and architecture of enterprise messaging He intends to spend the next 20 applying these same technologies to benefit individuals through technologies such as Personal Cloud and Internet of Things He recently left IBM where he was a product manager for the WebSphere messaging product family to start loPT Consulting with the mission of putting People first in the Internet of Things He can be found at https ioptcponsulting com or https t rob net Full disclosure TRob is a member of the Respect Network and the Personal Data Ecosystem Consortium but please don t hold that against them Resources FileThis http filethis com Kynetx Developer Resources http developer kynetx com LastPass https lastpass com Mint http www mint com OwnCloud https owncloud com PDEC http pde cc Personal Clouds org http personal clouds org Privacy by Design http www privacybydesign ca Project VRM http projectvrm org Respect Network http respectnetwork com WWW LINUXJOURNAL COM OCTOBER 2013 113 Personal The First d DOC SEARLS Platform for Everything Computing started out corporate then it got personal Same thing happened with networking Next up the cloud aybe the biggest thing t
65. ded step by step performance analysis and fast cross compile on x86 The latter feature enables developers to compile ARM code on fast x86 processors and transter the compiled application to ARM The v5 5 release also offers a full suite of programming tools GPU accelerated math libraries and documentation tor both x86 and ARM based platforms http www nvidia com Gumstix s Geppetto Platform Gumstix continues to add fire power and options to Geppetto the company s modular drag and drop platform for designing and building customized single board Linux solutions The most recent enhancement to Geppetto involves the addition of the Texas Instruments Sitara AM3354 processor which Gumstix says will offer more EY to users and raise GARPELOS ability to Pe gumstix a rapid go to market strategy for its customers While designing a board using Geppetto users simply drag and drop the processor onto a board and then connect the desired features to implement it Fully assembled single board computers are ordered at the touch of a button and arrive within 20 business days Furthermore notes Gumstix Geppetto s support for the Yocto Project build system makes it easy for developers to create a complete portable solution with minimal time and effort http geppetto gumstix com 60 OCTOBER 2013 WWW LINUXJOURNAL COM NEW PRODUCTS Dan McCreary and Ann Kelly s Making Sense of NoSQL Manning Publications NoSQL to
66. default mode of operation The Personal Data Ecosystem Consortium s mission Is to connect entrepreneurs and startups focused on user centric personal data advocate for individuals rights to tools and access to their own data and to help existing businesses dependent on the old personal data ecosystem transtorm to become profitable in the new one The Respect Network INDEPTH extends the basic connectivity of the Internet with a community and context for trusted identity and interactions between people businesses and devices There is a growing collection of information references and index of projects related specifically to Personal Cloud at Personal Clouds org The folks at Kynetx have built and implemented CloudOS and an event network that are up and running today and built on the Personal Cloud philosophy This is a non inclusive list but will jump start your investigation into Personal Clouds Data aggregation and integration Much of the value of data lies in the ability to correlate and analyze across many datasets to tind valuable relationships For example consumers can participate in cradle to cradle tracking of recyclable resources by integrating data trom their purchasing waste and recycle streams Add Health data to the mix for insight into how dietary purchasing habits affect wellness Integrate power and water consumption for a total household greenness rating But which vendor will collect and
67. e __proto__ property is defined on an empty object If so it loads Zepto If not it loads jQuery This is where copying the code that comes with Foundation is probably the best choice just make sure that when you deploy your application you have both Zepto and jQuery available 4 Load the Foundation JavaScript file itself which gives you the capabilities you wanted 5 Activate Foundation using the formula by invoking the foundation function on the document object This syntax works with both jQuery and Zepto document foundation Note that although steps 1 and 2 take place in the lt head gt section of the HTML Tile the remaining steps which involve JavaScript are placed at the bottom of the page just before the closing lt body gt tag This is a common technique for speeding up JavaScript execution and it ensures that the browser parses and displays AT THE FORGE the page before loading and executing external JavaScript Tiles A minimal file that uses Zurb Foundation with a Hello world headline and paragraph in the body is shown in Listing 1 Layouts with Foundation It you look at the Tile in Listing 1 in your browser you might well be disappointed by how it looks The text is too close to the edge of the page and it doesn t have any of the pizazz that you would have expected from a framework Well there s a simple reason for this It hasn t used any of the styles that F
68. e here am going to talk about only mutt COLUMNS HACK AND Installation and Configuration file such as you may have exported The rss2email program already had from Google Reader when you jumped Debian packages so on my system ship you can import that installing it was as easy as typing apt get install rss2email If r2e opmlimport file opml for some reason it isn t packaged for your distribution follow the steps At any point you also can export on http www allthingsrss com all of your contigured feeds from rss2email getting started with rss2email as an OPML Tile rss2email to download and extract the rss2email tarball This is Python r2e opmlexport software so you will need Python 2 x on the system as well as some sort Once you have added some feeds of local Sendmail program Postfix or you will want to poll them for new Exim works as well or alternatively stories Now the Tirst time you run you ll need to identify an outbound r2e against these feeds it will pull in mail server you can use to send these all stories in the feed which probably e mail messages includes some you already have seen Once rss2email is installed If you want to avoid that the first you interface with it via the r2e time you will want to run command To set up a new rss2email database containing your feeds type r2e run no send r2e new youremail yourdomain net Otherwise run Note that the e mail addr
69. e the if then else f blocks by executing the conditional statement without the if part and checking its output by typing echo DHCP The DHCP Dynamic Host Configuration Protocol is a protocol to provide hosts with the necessary information to access the network on demand This includes the IP address for the host the DNS servers the gateway server the time servers the TFTP server and so on The DHCP server also can provide the name of the file containing the kernel WWW LINUXJOURNAL COM OCTOBER 2013 97 FEATURE A Handy U Boot Trick image that the host must get from the TFTP server to continue booting The DHCP server can be set up to provide a configuration either for the entire network or on a per host basis Configuring the filename Listing 5 for the entire network is not a good idea as one kernel image or ELF file will execute only on the architecture for which it was built For instance the vmlinuz image built for an x86_64 will not work on a system with an ARM based processor The Ubuntu apt repository offers two DHCP servers isc dhcp server and dhcpcd preter to use isc dhcp server The isc dhcpd server from the Ubuntu repository is pretty advanced and implements all the necessary features recommend using Webmin to contigure it Webmin is a Web based configuration tool that supports configuring several Linux based services and demons IMPORTANT NOTE Be extremely careful while usin
70. eat for beginners as well as advanced Big Data practitioners It s a great conference Ryan Wood Software Systems Analyst Government of Canada October 15 17 2013 If you re in or about to get into Big Data this is the conference to go to Jimmy Chung Manager Reports Development Avectra The HC conference for Big Data and IT professionals _ Big Data TechCon is a trademark of BZ Media LLC COLUMNS THE OPEN SOURCE CLASSROOM ts a Bird it s Another Bird Build your own backyard Ustream sorta My new full time job is one that office is that an office with a window can do from my home office One is almost guaranteed Because have of the perks of working at a home an office window for the first time in 49 0 k Figure 1 BirdTopia as Seen via BirdCam 48 OCTOBER 2013 WWW LINUXJOURNAL COM COLUMNS THE OPEN SOURCE CLASSROOM So what does my obsession with bird watching have to do with Linux my career not counting the one year had a part time office facing the dumpster figured it would be the perfect opportunity to put up some bird feeders Unfortunately for my family but very fortunately for the local birds when I decide to do something usually go all in Rather than a simple feeder with mixed bird seed decided to get various types of feeders specialized seed a bird bath with flowing water and trees planted for sh
71. ed on Flash Apply power and watch the Linux X Windows User Interface appear on the vivid 7 color LCD Interact with the PPC E7 using the responsive integrated touch screen Everything works out of the box allowing you to concentrate on your application rather than building and configuring device drivers Just Write It and Run lt www emacinc com panel_pc ppc_e7 htm EMAL inc EQUIPMENT MONITOR AND CONTROL Phone 618 529 4525 e Fax 618 457 0110 e Web www emacinc com YEARS OF SINGLE BOARD SOLUTIONS WWW LINUXJOURNAL COM OCTOBER 2013 11 LETTERS Reader disappeared so that wouldn t be dependent on any system Basically host my own site and use a plugin called wp o matic that goes out and grabs the RSS feeds that program it with Because l m using WordPress can categorize those feeds look on the right hand sidebar for the categories and now can view articles by category or by searching Most important can click on a day in the calendar and read all feeds for that particular day LINUX JOURNAL Android Download app now in the Android Marketplace www linuxjournal com android And because also have subscribed to Keep America At work via the e mail Subscription plugin automatically get a copy of everything that gets added via e mail in case become too busy to check the site itself So far it works like a champ The downside is that if you re Subscribed v
72. ed them out You can t see if you ve misjudged their mental strength for the day and completely wiped out their ability to use their brain to correct the technical mistake you re trying to get them to fix Linus posed his response as being 14 OCTOBER 2013 WWW LINUXJOURNAL COM WHAT S NEW IN KERNEL DEVELOPMENT People are different I m not polite and get upset easily but generally don t hold a grudge have these explosive emails And that works well for some people And it probably doesn t work well with you And you know what That s fine Not everybody has to get along or work well with each other But the fact that it doesn t work with you doesn t make it wrong And he said that the issue was really about how to work together DESPITE people being different Not about trying to make everybody please each other He gave the example of Sarah s work with Greg saying that they worked a lot with each other probably because they did work well together and that that was as it should be The debate went on for a bit and ultimately the two of them and others decided to continue the discussion at the upcoming Kernel Summit over cookies and pot brownies The debate interests me personally because on the one hand no one should ever be abused That s what abuse is something that shouldn t happen Otherwise it s just an activity And on the other hand in my opinion not all of h
73. eilly sone E www drupalcampatlanta com
74. ess r2e run you use here will be the e mail to which rss2email will send the e mail The first time it may take a while messages Once the database is set because it reads all of your feeds up it s time to add feeds to it You and generates e mail Of course by can do that with default it will send all the stories to your INBOX so because control r2e add http feed someurl com rss my own mail server created a special e mail address for rss2email Or if you happen to have an OPML to use and then set up a procmail WWW LINUXJOURNAL COM OCTOBER 2013 43 COLUMNS HACK AND rule so that it forwarded all e mail when tell mutt to open the e mail messages sent to that address to a in an external viewer on pure shell Special rss mailbox sessions it means can view the full Of course rss2email updates article in a text based Web browser your feeds only when you run the such as w3m very easily And when command so you probably will want run mutt on a machine with a Web to run this within cron so it updates browser it can open the Tull article automatically Just run crontab e there instead as your regular user and add Managing Feeds FaF r2e run 2 gt dev null Managing feeds in rss2email is relatively straightforward First type This will run r2e every minute and r2e List to see a numbered list of output any random error such as all of your feeds You will use the when feeds are temporarily down
75. f ELF The BI uImage filename is the name of the kernel image Rename the image to whatever you use TFTP TFTP Trivial File Transfer Protocol is a lightweight Tile transter protocol It does not support authentication methods Anyone can connect and download any file by name from the server or upload any file to the server You can however protect your server to some extent by setting firewall rules to deny IP addresses out of a particular range You also can make the TFTP home directory read only to the world This should prevent any malicious uploads to the server The Ubuntu apt repository has two different TFTP servers atftp and tftp hpa recommend tftp hpa as development of atftp has seized since 2004 tftod hpa is more or less ready to run just after installation The default file store is usually var lib tftoboot and the configuration files for tftp can may be found in etc default tftod hpa You can change the location of the default file store to any other location of your choice by changing the TFTP_DIRECTORY option The TFTP installation creates a user and a group called tftp The tftp server runs as this user recommend adding yourself to the tftp group and changing permissions on the tftp data directory to 775 This will let you read and write to the tftp data directory without switching to root each time Moreover if files in the tftp data directory are owned by root the tftp server will not
76. f existing objects of another No scripting programming or extra databases are required The Windows Intel 32 bit platform also is supported http www dirwiz com ee a mer Coraid ZX4000 File Storage Appliance Public cloud scalability economics and resilience models are three macroforces affecting IT Storage specialist Coraid s response to these trends is the new ZX4000 File Storage Appliance a storage building block solution for both enterprise and cloud deployments that combines Flash performance multi petabyte scale and distributed resilience Coraid suggests that the ZX solution s unique architecture allows for a potentially limitless pool of elastic shared block storage that easily scales performance via the addition of more ZX appliances The ZX4000 can be deployed in a resilient architecture that offers protection against up to three shelf or drive failures while retaining high storage efficiencies of around 80 This enterprise class storage solution says Coraid is available at a cost comparable to consumer grade public cloud services and at a fraction of the cost of legacy NAS storage Since its introduction in 2012 the ZX product line has been deployed by customers in a wide variety of applications including backup public and private clouds and media http www coraid com products 62 OCTOBER 2013 WWW LINUXJOURNAL COM NEW PRODUCTS Ni el E The Document S i Foundation s LibreOffice The Document
77. f you ve got a Nokia device sitting in a drawer gathering dust pull it out and put it to use version Grab either one from the perhaps as it s very easy to make a Google Play store mess of things Flashing your car s Note that this solution is for read computer with a new fuel curve or only access to the OBD II system in ignition timing map is a nontrivial the car You can t modify the running exercise that requires an adapter with parameters of the vehicle with this different voltage levels and different adapter unfortunately or fortunately software So don t worry about WWW LINUXJOURNAL COM OCTOBER 2013 67 FEATURE Be a Mechanic with Android and Linux breaking your ae nh Ske te 8 sol ution you re Engine Management Diagnostics and Tools just peeking Profile 2009 Pontia under the hood Using Torque and ae the Soliport D Bluetooth Frim Adapter The Soliport adapter comes with a little CD ROM in the box but it s not required for use ndogitel with an Android Ti Status device To get Started you Tirst need to find the OBD II port in your car In most cars sold in the EE United States Results the port is under the dash on the driver s side of the car Find the port and plug the Soliport in to it aie Next start the car because the Figure 2 The Torque Home Screen 68 OCTOBER 2013 WWW LINU
78. figuration Arrow keys navigate the menu lt Enter gt selects submenus gt Highlighted letters are hotkeys Pressing lt Y gt includes lt N gt excludes lt M gt modularizes features Press lt Esc gt lt Esc gt to exit lt gt for Help lt gt for Search Legend built in excluded lt M gt module lt gt ais a System Type gt FIQ Mode Serial Debugger Bus support gt Kernel Features gt Boot options gt CPU Power Management gt Floating point emulation Userspace binary formats i ower Management op Networking support v gt lt Exit gt gt gt lt Help gt Figure 1 Selecting Power Management Options The last step allows you to customize your kernel In order to avoid a long and painful debugging process always make Sure you are able to compile the minimal kernel that means compiling without any options added successfully first Once you succeed you can add more options to your kernel Note any options you add to the kernel configuration as it will aid you in figuring out which feature s does not work 78 OCTOBER 2013 WWW LINUXJOURNAL COM There is a special step you should adhere to if you are compiling the kernel for A13Micro boards You need to remove the option to Suspend to RAM and standby which is located under Power Management options A13Micro boards do not support this option If you are planning to use
79. files shp Open Cancel Figure 2 Adding a new layer opens a file selection dialog where you can choose an SHP file WWW LINUXJOURNAL COM OCTOBER 2013 19 t UPFRONT RR k Ml Legend o E E E g Zt ogl L_ DEFAULT Figure 3 By default Thuban just displays all of the data with a single symbol color home province of New Brunswick Figure 2 This includes several different geographical items such as water river banks and parks The default display is not very interesting yet Figure 3 You can edit the way a layer is displayed either by double clicking the layer within the list in the legend pane or by right clicking the layer of interest and selecting Properties This will pop up a new window Figure 4 In this case selected the type field within the classification pane The easiest choice at this point is to click 20 OCTOBER 2013 WWW LINUXJOURNAL COM the Generate Class button The Generate Classification window will pop up where you can click on the Retrieve From Table button to get a list of the possible values accepted the default gray scale mapping for the colors giving tour new entries in the layer properties But this is not very interesting either yet Selecting each of the new properties you can edit the symbol and change the colors for each of the types Figure 5 If you want to have a preview of what this will look like you can click the Try button If
80. for supporting our advertisers by buying their products ADVERTISER All Things Open AnDevCon Fall Big Data TechCon Drupal Camp Atlanta Emac Inc EmperorLinux iXsystems Inc Manage Engine Seattle GNU Linux Conference Silicon Mechanics USENIX LISA http www allthingsopen org http Awww andevcon com http www bigdatatechcon com SanFrancisco2013 index html http Awww2 mediacurrent com I 10072 2013 09 10 fw6gp http www emacinc com http Awww emperorlinux com http www ixsystems com http Awww manageengine com http Awww ovh com http seagl org http Awww siliconmechanics com https www usenix org conference LISA2013 The Linux Journal brand s following has grown to a monthly readership nearly one million strong Encompassing the magazine Web site newsletters and much more Linux Journal offers the ideal content environment to help you reach your marketing objectives For more information please visit http www linuxjournal com advertising WWW LINUXJOURNAL COM OCTOBER 2013 117 EOF management system is a silo each with its own silo d relationships with customers all of which are governed at call centers by IVR Interactive Voice Response systems followed by scripted interactions when a customer gets through to a human being If ways can be found to normalize the protocols of genuine relationships between companies and customers the work of t
81. g the DHCP server A network must not have more than a single DHCP server A second DHCP server will cause Listing 5 The Host Configuration Section for a DHCP Server subnet 192 168 0 0 netmask 255 255 0 0 next senver 192 168 146 1 option domain name servers 192 168 146 1 option routers 192 168 146 1 range 192 168 145 1 192 168 145 254 The BeagleBone Black 1 host BBB 1 next server 192 168 146 1 filename BI uImage hardware ethernet C8 A0 30 B0 88 EB fixed address 192 168 146 4 recommend installing Webmin from the apt repository See the Webmin documentation for instructions for adding the Webmin apt repository to Ubuntu http www webmin com deb html Once you have your DHCP server serious problems on the network Other users will lose network access If you are on a corporate or a university network you will generate a high priority incident inviting the IT department to come looking for you 98 OCTOBER 2013 WWW LINUXJOURNAL COM installed you need to configure a subnet and select a pool of IP addresses to be dished out to hosts on the network on request After this add the lines corresponding to the host trom Listing 5 into your etc dhcp dhcpcd cont file or do the equivalent from Webmin s intuitive interface In Listing 5 C8 A0 30 B0 88 EB corresponds to the BeagleBone s Ethernet address The next server is the address of the TFTP server from which to fetch the kernel image o
82. ges on my own system a set of JPEG format files on my http www AskDaveTaylor com site here s what get checkres sh jpg Warning Image auction seller img1l jpg has Resolution 75x75 Warning Image auction seller img2 jpg has Resolution 75x75 Warning Image browsing the photo folder jpg has Resolution 96x96 Warning Image brushed metal jpg has Resolution 300x300 That s a surprise didn t realize that had 300x300 and these other weird resolutions An easy way to speed up my site therefore is to lower the resolution on these images to the COLUMNS WORK THE SHELL Standard 72dpi This is something height and width that also can be done with a call to a different ImageMagick utility but height identify image cut d f3 cut dx f1 let s tackle that in another article width identify image cut d f3 cut dx f2 Working with Image Size There s no need for verbose output Since write a lot of scripts that because the geometry of the image is harvest images or other content trom included in the default output sites and repurpose them for my own Now It s easy to produce higher generally private not public tacing quality HTML for example by including use also find it is darn helpful in a images with their proper dimensions shell script to be able to ascertain the size of an image l ve just grabbed echo lt img src image height height width width gt If you ve guessed that ident
83. h a graphical user interface you need to use a lightweight GUI environment because the board does not have much RAM to spare There are several options from which to choose such as LXDE and XFCE4 however use a different package here called Fluxbox You also need to install a light graphical login manager Using the package manager install lightdm and fluxbox Yes it is really that easy These commands will install the desktop environment graphical login manager and their required servers and libraries root al3board apt get install lLightdm fluxbox Resources Restart the board When the board restarts you will be greeted with your new login manager Make sure you select Fluxbox from the session menu on Lightdm screen when you are logging in Enjoy your new mini personal computer server m Ronald Kurniawan is a software developer living in Brisbane Australia Ronald is interested in embedded systems Linux Java development and trying to come up with interesting and wacky ways to combine them Ronald can be reached at r kurniawan fluxodesign net LELLELECELLECETLECELOECETTEEELTEEEETETEIT ROD Send comments or feedback via http www linuxjournal com contact or to ljeditor linuxjournal com Debian Repositories List http www debian org mirror list A13Micro s Kernel Configuration File http goo gl YnZ1s Script bin for A13 and A13Micro Boards http goo gl 7QZuo0U Ubuntu 12 04 Core Root Filesystem
84. halt the screen Foundation makes that easy to do Create a new lt div gt tag and give it two classes First give it one that represents the number of columns out of 12 that you want your text to use So to extend all the way across you would say large 12 To extend halfway across you would say large 6 and to extend one quarter of the way across you would use large 3 If columns within a row don t add up to 12 you can get some funny looking results Second you add the columns class allowing Foundation 30 OCTOBER 2013 WWW LINUXJOURNAL COM to display your site using appropriate columns Given these the text looks like this lt div class row gt lt div class Large 6 columns gt lt h1i gt Hello world headline lt h1 gt lt p gt Hello world paragraph And even more hello world And even even more more hello world And so on and so forth And again And even more hello world And even even more hello world And so on and so forth lt p gt lt div gt lt div gt If you want two side by side columns you easily can do that lt div class row gt lt div class Large 6 columns gt lt h1l gt Hello world headline lt h1 gt lt p gt Hello world paragraph And even more hello world And even even more more hello world And so on and so forth And again And even more hello world And even even more more hello world And so on and so forth lt p gt lt div gt lt div
85. han that multiple computers both internal of the photo snapshot and on the Internet also wanted The built in Web server on the to be able to share my BirdCam phone is probably sufficient if you with the world but wanted to just want to watch from one or two serve everything myself rather than computers on your network For depend on a service like Ustream WWW LINUXJOURNAL COM OCTOBER 2013 51 COLUMNS THE OPEN SOURCE CLASSROOM Android Webcam Server oe qF 192 168 1 201 8080 js html My G Android webcam server If no video appear below check if you have javascript enabled p Open camera controls IP Webcam Remote Mozilla Firefox Se Fullscreen view click video to chang 192 168 1 201 8080 remote html ore IP Webcam Remote Click here to play audio with browser Click here to play audio in external Turn on LED Turn off LED ei ae Autofocus Autofocus Cancel autofocus Take full res picture Autofocus and take full res picture Audio in case your external player does not support separate streams Click here to play auc audio with browser Click here to play audio in external media player Right click here and select save as to record it Figure 4 The Android Webcam software is far more robust And that s where things started to in my home office has 5Mbit upload get really really fun speeds it
86. happier including the search engines Now you know m Dave Taylor has been hacking shell scripts for more than 30 years Really He s the author of the popular Wicked Cool Shell Scripts and can be found on Twitter as Davelaylor and more generally at http www DavelaylorOnline com The Open Source World comes to Raleigh NC ALL THINGS OFEN mov UC TUBER 23 24 Z013 RALEIGH CONVEN TION CEN TER 500gle github A Jessica McHellar PH Whurley A Ano Huni Angie Webchick Byron Lee Congdon a O redhat Caen Scott Chacon Boo g Chris Aniszezyk R Open Source in the Enterprise m i 3 U eo a ta od y grer A a m eee ee e u le ou es a the ae mn A M em ree eir oe a e 3 N TEn a mm aA f Ami ae oom i eave a ac N ih Comes ET a B J Fp i _ IP Ai a gt P i EN p x i amp iS On 4 l i PEE ay P 7 KI 7 al nn t Pil i he i i 1 a l a ee Mie A apra nar ee A A gt COLUMNS HACK AND Command Line Cloud rss2email KYLE RANKIN Now that Google Reader is dead and buried I ve switched to a much simpler approach to viewing RSS feeds In my last article started a series called Command Line Cloud The intent of the series is to discuss how to use the cloud services we are faced with these days without resorting to a Web browser spend most of my time on the command line so that s where I d most like to interface with cloud services
87. hat ever happened to Linux at least scale wise is virtualization As recall virtualization first materialized in a big commercial way with IBM which started by putting many Linux instances on System z mainframes Once on the old Linux Show we had a guest geek from IBM who said it was not only his idea but also that he came up with it over lunch IBM didn t call those mainframes clouds but that s what it hosted Now we have clouds of clouds of Linux all over the place Nothing could be more widespread and ordinary Of Netcratft s ten most reliable hosting company sites for June of this year 114 OCTOBER 2013 WWW LINUXJOURNAL COM eight are Linux and two are FreeBSD http news netcraft com archives 2013 07 01 most reliable hosting company sites in june 2013 2 html Now think about the Internet of Things often abbreviated loT It is generally assumed today that the Internet of Things will require embedded smarts But in fact any thing can have a cloud whether the thing has embedded smarts or not This insight comes to us from Phil Windley http www windley com the hacker in chief of Kynetx http kynetx com a small Utah start up with very big plans Disclosure sometimes consult them as do a number of other companies Phil is also the inventor and alpha maintainer of CloudOS a small and simple cloud operating system for anybody and anything including you and every thing you ow
88. he penetration tester Drozer provides support for any Android device running Android 2 1 and beyond covering 99 of the devices in the market The open source tool is available to download trom the MWR Labs Web site http www mwrinfosecurity com Please send information about releases of Linux related products to newproducts linuxjournal com or New Products c o Linux Journal PO Box 980985 Houston TX 77098 Submissions are edited for length and content WWW LINUXJOURNAL COM OCTOBER 2013 63 FEATURE Be a Mechanic with Android and Linux BEA MECHANIC with ANDROID and LINUX 6 5 13 CHECK Check Engine Soon that little orange light on your car s instrument panel is possibly one of the more annoying things about modern automobiles Ever had it pop on during a trip and wonder whether it was just something mundane like your gas cap being loose or whether it s something deathly serious and a piston could come shooting out the side of your engine block at any time Well thanks to an inexpensive little piece of hardware and an Android tablet lII help you decode that little orange light in your car BILL CHILDERS 64 OCTOBER 2013 WWW LINUXJOURNAL COM he human race has had automobiles for more than 100 years now but we ve had computer monitors and control engine operation only for around 30 years or so The first computer controls were primitive hard to work with and expensive Each autom
89. he call center can be made far more easy and efficient In fact the only way that can happen is if the customer s side does the normalizing Once that happens both sides can learn far more from each other in far better ways If the product is the platform for a genuine two way relationship both company and customer are In far better positions to learn from each other Companies can update manuals and provide notices of firmware updates Customers can tell companies directly what s working or not working how the product might be improved and what new products the company might consider making We also can start to evolve past the current marketing system by which makers and sellers labor constantly to entrap and coerce customers into restrictive dependencies Communications inside silo d coercive systems tend to be far more restrictive and far less useful than communications between free and independent parties 118 OCTOBER 2013 WWW LINUXJOURNAL COM who are ready and able truly to help each other At this point as T Rob says in his article in this issue we re still at the beginning of whatever it is we ll make of personal clouds CloudOS itself is about where Linux was in the months after Linus wrote I m doing a Tree operating system But the population of available hackers for personal cloud projects is several orders of magnitude larger than the one to which Linus wrote Yet the challenge is remarkably
90. he kernel by executing the script in bootcmd Hence this is the variable that must be modified To begin you ll need the source code to U Boot from the git repository git clone git git denx de u boot git Before making any modifications recommend compiling the unmoditied source code as a sanity check make ARCH arm CROSS COMPILE arm linux gnueabihf distclean make ARCH arm CROSS COMPILE arm linux gnueabihf am335x_evm_config make j 8 ARCH arm CROSS COMPILE arm 1linux gnueabihf This most likely will work without a hitch Now you can modify the u Boot include contigs am335x_evm h file In this file you ll tind code similar to Listing 9 Modity this as you please and re compile Depending on your target board you will have to modity a different file The files to some common target platforms are E Panda Board http pandaboard org u Boot include contigs omap4_common h E BeagleBoard u Boot include contigs omap3_beagle h Conclusion hope the instructions provided here help you create a system to develop and deploy bare metal programs and kernel images quickly You also may want to look into u boot v2 also Known as Barebox http barebox org The most helpful code modification that suggest here is to compile the U Boot with an elaborate boot sequence that you can tailor to your needs with the least modifications You can try out some fancy scripts to check and update firmware over LAN I w
91. he pack What will your Stupid Cloud Tricks be Feel free to dream some up and send them to ljeditor linuxjournal com Or just wait a few years and create them for real Personal Cloud Opportunity These types of applications are not only possible but trivial when we all have access to our own data and are not dependent on vendors for the integrations Personal Cloud detractors claim that individuals have shown no interest in having access to their own data Until PRISM many said we have no interest In privacy either But this is not a question of whether Personal Clouds will exist or whether individuals need or want access to their own data Technology seeps into every niche that will Support It and this is hardly a niche When the value of Personal Cloud apps exceeds their cost they will flourish It really is that simple The market for Personal Clouds is a superset of that for mobile phones game consoles NAS devices home entertainment servers and home automation servers because they are all potentially participants That is a very large market which with regard to Personal Cloud is as yet untouched Those who can make the value of Personal Cloud exceed the cost as measured in currency skill requirement and administrative overhead can begin to carve out their own piece of that very large pie Would you like your piece of that pie now For more information on Personal Clouds and the ecosystem growing up aroun
92. hould be fairly selt explanatory but basically 1 See if phone is on line COLUMNS THE OPEN SOURCE CLASSROOM 2 Get photo from phone with how long it took me to fiddle around a short timeout by default with commands ideas loops and timeout is absurdly long and an so forth before coming up with the occasional hiccup shouldn t stall scripts shown here As with all my the entire system articles please Teel free to change and or improve on my ideas to best Tit 3 Store photo in ramdisk did this your needs These scripts have been to save on hard drive wear figure running smoothly for weeks now I m saving a Tile every second and they seem to be fairly bulletproof and it s silly to do that to spinning when it comes to network failures media every time and such Getting the photos regularly updated however was only 4 Compress and annotate the halt the problem as it turns out photo At first had my phone in the easier half portrait mode so had to rotate as well The convert program Step 2 JavaScript and Breaking which is part of the ImageMagick the Internet package is very powerful added In order to display the constantly a timestamp to the photo mainly updated bird photos it was easy because could enough to create a symbolic link trom dev shm birds jog to var www birds 5 After download and conversion is where my Apache virtual host folder complete mv the temporary file to was loca
93. ia the e mail plugin and you add a bunch of new feeds you will get a bunch of e mails until it processes the new feeds but then because most places release only one or two articles Sinatra HTMLS Catalyst Drupal 7 Moodle INTRO TO THE THE BEST WAY tO We pe gt 7 mm NEW COLUMN THE OPEN SOURCE SSROOM For more information about advertising opportunities within Linux Journal iPhone iPad and Android apps contact John Grogan at 1 713 344 1956 x2 or ads linuxjournal com per day it is very manageable Virgil Interesting concept Over the past few months I ve written about a few ways to replace Google Reader but creating a personalized blog that writes itself based on subscribed feeds that s interesting Of course it makes me want to have you add your own RSS feed to your feed aggregation setup to see if it blows itself up but that s just the prankster in me coming out Shawn Powers Cerberus II often pass on Shawn Powers Android Candy tips to my wite did so this month for the Cerberus app but then almost immediately saw this story Google Unveils Android Version of Find My iPhone http officialandroid blogspot com 2013 08 find your lost phone with android html You might want to alert your users to this development in next month s LJ Bob L Thanks Bob This is especially interesting based on Aviv s letter regarding Cerberus It does mean l
94. ify Is the key you re right In fact given an What s better is that Web browsers image this is an easy way to grab Its are able to scale images automatically LINUX JOURNAL iPad iPhone PACK THIS ox a f B oaoa N TWORK xs T OLPC Arduino Trim Slice vDSO El woe LOAN L A HOME ROUTE RA LOW VER SERVER H THE ADD A CUSTOM vDS A LINUX KERNEL Ip a Music Bm That Get Started Create a Unified WS You Around Programming B Boot Environ the Arduino OnaUSB Dive Available on the R App Store linuxjournal com ios pua s te Rowers For more information about advertising opportunities within Linux Journal iPhone iPad and Android apps contact John Grogan at 1 713 344 1956 x2 or ads linuxjournal com COLUMNS WORK THE SHELL so if you specify a height and width that are different from the default dimensions oops sorry geometry of the image it ll scale automatically This means if want to include the Ovp jJog image on an automatically generated page but decide 970 pixels is just too wide can simply include it as lt img src pvp jpg height 207 width 646 gt and the browser be it Chrome Safari or even MS IE will scale it appropriately Calculating the smaller size is straightforward with bc another underappreciated Linux command The entire sequence might look like this to scale the image to 66 of its original dimensions bin sh identi fy us
95. in jill linuxjournal com Senior Editor Doc Searls doc linuxjournal com Associate Editor Shawn Powers shawn linuxjournal com Art Director Garrick Antikajian garrick linuxjournal com Products Editor James Gray newproducts linuxjournal com Editor Emeritus Don Marti dmarti linuxjournal com Technical Editor Michael Baxter mab cruzio com Senior Columnist Reuven Lerner reuven lerner co Security Editor Mick Bauer mick visi com Hack Editor Kyle Rankin greenfly net Virtual Editor Bill Childers bill childers linuxjournal com Contributing Editors Ibrahim Haddad Robert Love Zack Brown Dave Phillips e Marco Fioretti e Ludovic Marcotte Paul Barry e Paul McKenney Dave Taylor Dirk Elmendorf Justin Ryan e Adam Monsen Publisher Carlie Fairchild publisher linuxjournal com Director of Sales John Grogan john linuxjournal com Associate Publisher Mark Irgang mark linuxjournal com Webmistress Katherine Druckman webmistress linuxjournal com Accountant Candy Beauchamp acct linuxjournal com Linux Journal is published by and is a registered trade name of Belltown Media Inc PO Box 980985 Houston TX 77098 USA Editorial Advisory Panel Brad Abram Baillio e Nick Baronian Hari Boukis e Steve Case Kalyana Krishna Chadalavada Brian Conner Caleb S Cullen Keir Davis Michael Eager e Nick Faltys e Dennis Franklin Frey Alicia Gibb Victor Gregorio
96. ink of these things as motors that wash clothes tell time or spin digital 106 OCTOBER 2013 WWW LINUXJOURNAL COM media The motors have receded into the background and we rarely think about them at all unless they break The same thing is happening now with computing There is more computing capacity in the average modern phone than there was in the Lunar Lander It s everywhere around you and more is on the way All of your devices that have an embedded motor soon will have embedded computing power if they do not already Things that currently have no motor or computing power switches outlets and bulbs for example soon will become smart More important all of these sensors devices and computing platforms are increasingly interconnected and integrated with if then else rules engines that correlate events to generate complex behaviors in formerly dumb devices Sensors actuators and computing power are quietly but inexorably being woven into the fabric of your lite Is it reasonable to assume that with all this computing power available to individuals that we will fail to apply it in commercial settings for our own benefit in much the same way that our vendors have applied it on the supply side The value proposition of E Commerce Supply Chain Management and Customer Relationshio Management always applied to individual users We never delivered it to that market because of cost but that barrier continues
97. ion 4 7 E ncurses devy 76 OCTOBER 2013 WWW LINUXJOURNAL COM E uboot mkimage E git E debootstrap E debian archive keyring if you decide later that you want to use Debian rootfs E gemu user static Once you finish installing the prerequisites you then need to create several softlinks in the same directory where gcc 4 6 arm linux gnueabihf is installed in my case it is located in usr bin Use the which command to find the installation directory which arm linux gnueabi gcc 4 6 Next create softlinks for arm linux gnueabiht gcc 4 6 arm linux gnueabiht gcov 4 6 and arm linux gnueabiht cpp 4 6 sudo ln s usr bin arm linux gnueabihf gcc 4 6 usr bin arm Linux gnueabihf gcc sudo ln s usr bin arm 1linux gnueabihf gcov 4 6 usr bin arm linux gnueabihf gcov sudo ln s usr bin arm linux gnueabihf cpp 4 6 usr bin arm 1Linux gnueabihf cpp Preparing the Kernel and U Boot The good people at Linux Sunxi are kind enough to share the kernel and U Boot code tailored to run on Allwinner chips You have the option of getting and compiling version 3 0 or 3 4 of the Linux kernel The compilation procedures are similar For the purpose of this article am using kernel version 3 4 Get the kernel and U Boot source from Linux Sunxi s GitHub repository git clone b sunxi 3 4 https github com lLinux sunxi lLinux sunxi git git clone b sunxi https github com Linux sunxi u boot
98. ion is a worthy competitor to Twitter Bootstrap I was recently speaking with a new client about a consulting project and we were discussing the technologies we were going to use said So assume that we ll be using Twitter Bootstrap as a CSS framework right Bootstrap of course is the open source CSS framework written in the LESS language that recently released its third version which has become wildly popular among Web developers I ve used Bootstrap on a number of projects in the past few years and I ve been pleasantly Surprised to discover just how easily could implement layouts menus and sidebars as well as produce nice looking tables and buttons was surprised when the client said No we re actually using Zurb Foundation Now had heard of Foundation before Zurb is a Web design company based in California whose Foundation framework preceded and inspired Bootstrap 26 OCTOBER 2013 WWW LINUXJOURNAL COM in many ways But it really hadn t registered much on my radar and hadn t paid much attention to it It turns out that should have been paying attention Zurb is a worthy competitor to Bootstrap and it has some advantages that make it more appropriate In some cases So in this article take a look at Zurb Foundation considering it both as a Standalone CSS framework and as something you can use trom within an application framework such as Ruby on Rails Zurb recently released
99. ioner when it or a neighboring utility has a peak load shortage But why limit this to water heaters and air conditioners When the home is filled with smart devices it will be possible for lights fans battery chargers or any powered device to take part in discretionary load abatement For example on receiving an abatement request an LED bulb or the dashboard controlling that bulb might respond with an offer to cut 10 of its current drain during the abatement period Because the house knows whether anyone is home the degree of abatement can vary automatically and accordingly 112 OCTOBER 2013 WWW LINUXJOURNAL COM You don t have to honor the pledge and can turn the light back up but the closer your house gets to its projected abatement the larger the rebate you get With enough devices participating discretionary load abatement will allow us to defer the need to build more power plants But this considers only the first tier effects The system really gets interesting when social aspects are added Your Personal Cloud knows how much load abatement you have provided what your baseline usage is and the normal interior conditions in the house Someone eventually will combine these into a competitive social app where individuals or groups can compete for energy efficiency badges How do you compare with your neighborhood Your region Households with similar demographics Can your scout troop be the greenest in t
100. is yelling is really abuse For one thing it s an e mail list and there is a long and glorious history of flame wars on e mail lists People aren t required to participate even when t UPFRONT Linus Torvalds is the one doing the flaming So I m interested to see what kind of public pressure ultimately will come to bear on Linus to stop doing something that s really an ordinary on line activity _ZACK BROWN Image from http www launchy net With Unity s method for launching and finding programs and applications and OS X s spotlight tool becoming the new way to launch programs the entire way we think about launching programs is changing Although still like to have a few icon shortcuts on my task bar many folks prefer a quick keystroke to bring up Gnome Do or Unity s launcher or even OS X s spotlight If you re one of those people but can t seem to find a smooth way to accomplish your launching on Windows check out Launchy Launchy is an open source demon Non Linux FOSS Launchy that runs on Windows OS X or Linux It listens for a predefined keystroke and then pops up a search window You start typing the application document or media file you want to Start and Launchy autocompletes based on its index of your system The main advantage Is the ability to launch a program without moving your fingers from the keyboard Launchy is fast accurate and doesn t steal lots of re
101. is used under terms of the Creative Commons 3 0 Attribution License A BZ Media Event Follow us twitter com AnDevCon Are you tired of watching a sad workstation chug through your data Sign up for a test drive on one of our GPU server solutions today See how you can accelerate your code or applications with parallel processing on NVIDIA Tesla KZOGPUS http www siliconmechanics com testdrive FS ee MECHANICS COE lett included NVIDIA wii C NTENT OCTOBER 2013 ISSUE 234 EMBEDDED FEATURES 64 Be a Mechanic with Android and Linux Decode Your Check Engine light Bill Childers 74 Create a Mini PC or Server with Olimex s Olinuxino A13 A13Micro Build a capable Linux personal computer or server with a cheap embedded system Ronald Kurniawan 91 A Handy U Boot Trick U Boot over LAN Bharath Bhushan Lohray ON THE COVER e Control Your Own Data with the Personal Cloud p 104 e Diagnose Your Car with Android p 64 e Test New Builds Quickly with a U Boot Trick p 91 e Build a Personal Computer or Server with an Embedded System p 74 e Shell Scripts and ImageMagick p 36 e How To Set Up Your Own BirdCam p 48 e rss2email a Simple Approach for Viewing RSS Feeds p 42 e Zurb Foundation Design a Responsive Web Site p 26 Cover Image Can Stock Photo Inc pzAxe 4 OCTOBER 2013 WWW LINUXJOURNAL COM sKe ce 6 1
102. lude the driver for the module which is called Realtek 8192C USB Wifi for SW and is located under Device Drivers Network device support Wireless LAN You are welcome to experiment with other Wi Fi devices can vouch that successfully run the A13 board with the Netgear WG111v2 USB Wifi Stick module The driver used for this Wi Fi device was Realtek 8187 and 8187B USB support You also have to make sure that TCP IP is selected and included in the kernel Tick Networking Support and press Enter to select it Go inside Networking options and make sure that TCP IP networking is selected Once you are satistied with your configuration save it and go back to the command prompt Issue the WWW LINUXJOURNAL COM OCTOBER 2013 81 FEATURE Create a Mini PC or Server with Olimex s Olinuxino A13 A13Micro following commands to compile the kernel and build the drivers make ARCH arm CROSS COMPILE arm linux gnueabihf ulImage make ARCH arm CROSS COMPILE arm linux gnueabihf INSTALL _MOD_PATH out modules make ARCH arm CROSS COMPILE arm linux gnueabihf INSTALL MOD PATH out modules install When the compilation finishes you will end up with the kernel image in KERNEL_DIR arch arm boot ulmage and the modules and drivers in KERNEL_DIR out lib modules KERNEL_VERSION The next step is to prepare a minimal filesystem for your board The easiest option I ve found so far is by using the
103. n CloudOS is open source and GPL d So is KRL kinetic rule language http en wikipedia org wiki Kinetic_ Rule_Language the first language for programming on CloudOS among other things also first authored by Phil By abstracting intelligence away trom physical things we can unburden those things of the need to be intelligent in themselves In fact we can enlarge to absolute the variety of things that can have intelligence Phil embodies this range in the word pico tor persistent compute object One of his is a pothole in front of his house http www windley com archives 2013 04 potholes_and_ picos shtml That pothole has brains in the cloud Phil gave to It and that cloud is in Phil s personal cloud http personal clouds org wiki Main_Page To help demonstrate how this can work in everyday lite here is a list of things I ve made smart by giving each its own cloud E Canon 5D camera body E Canon 30D camera body E Dish Network VIP 922 set top box with Slingbox M Eurorack UB802 audio mixer M LaCrosse Technology BC 9009 battery charger Sangean PR D5 radio Delkin Sensor Scope Ful backpack InFocus Model LP 130 projector Teac model HD 100 HD Radio receiver Sirius Sportster satellite radio receiver Garmin Legend HCx GPS A 30 x 30 tablecloth that looks like the QR code shown in Figure 1 https squaretag com app html app a41x178 squareTag_scanned amp tagName YUV6WT amp token
104. ndle hovering nicely as well such that moving the mouse cursor over a button dims it and clicking on It also gives visual feedback Again these are things you could do on your own but why bother when Foundation already has detined it Navigation Most sites on which work need to have a top navigation bar Foundation handles this easily as well For example let s say you want to have a title on the top navigation bar and then links to pages 2 3 and 4 of your site Doing this is a bit trickier than what you ve seen so far in that it requires some additional elements Because I m using HTMLS5 for this COLUMNS example let s take advantage of two special elements defined there lt nav gt and lt section gt which Foundation expects The top level navigation bar is defined in a lt nav gt element with a class of nav bar Within that you start a lt ul gt element normally used for bulleted lists with a class of title area Now the magic begins It you create an lt li gt element with classes of name and active the navbar now will have a title It s typical to put that name in an h1 tag and then to put the enclosed text Inside a link so that people can navigate to your organization s home page lt nav class top bar gt lt ul class title area gt lt li class name active gt lt hl gt lt a href gt Test site lt a gt lt h1 gt lt 1i gt lt ul gt lt nav gt
105. nts within that scope By incorporating these elements cloud architecture aims to deliver computing services that are as reliable and available as power or water The ultimate expression of the cloud is that the computing infrastructure completely disappears except for the user interface Personal Cloud Imagine a cloud database filled with information about you and a vendor inquiring of that cloud How much money do you make How old are INDEPTH you How much do you weigh What is your address Whether the cloud is personal or not depends on who gets to decide the answers to these questions It is not enough that the response back Is that s personal if someone else can override your preferences and make the disclosure anyway It is only a Personal Cloud if you have ultimate control over whether to disclose that information A Personal Cloud starts with the assumption that privacy is the default and natural state of affairs and then incorporates that design philosophy into a cloud computing architecture owned and operated by an individual Resist the temptation to read more into that statement than there is For example there is no requirement that a Personal Cloud must be self hosted Today there are commercial services for password management storage backups VoIP chat and more all of which Tit the definition of Personal Cloud In all these cases the custodians of the data have no access to it Instea
106. nuxjournal com contact or to ljeditor linuxjournal com The home page for Zurb Foundation is http foundation zurb com That site has good documentation and examples A nice introduction to Foundation albeit looking at the previous version from 2012 is at http www alistapart com articles dive into responsive prototyping with foundation also found it useful to read a comparison of Foundation with Bootstrap at http abetteruserexperience com 2013 08 twitter bootstrap 3 vs foundation 4 which one should you use Finally customization of Foundation is done with SCSS You can read my previous articles on the subject or go to the SASS Web site which describes both the SASS and SCSS syntaxes at http sass lang com 34 OCTOBER 2013 WWW LINUXJOURNAL COM a N AYZ A w OVH COM Dedicated Server You are in Control i fedora openSUSE 5 TB traffic 24 7 North American Support CPU Frequency RAM Hard disk www ovh com dedicated servers For more details lt q OVH COM Dedicated Servers Dedicated Cloud or contact us 1 855 684 5463 COLUMNS WORK THE SHELL image DAVE TAYLOR Manipulation with ImageMagick Think shell scripts can deal only with text You ll be amazed at what you can do as Dave begins his exploration of ImageMagick and its many useful tricks I ve spent a lot of time in this column talking about text processing and analysis
107. o speak the protocol The hardware use is the Soliport ELM327 Bluetooth OBD II Scanner see the Amazon link in the Resources section of this article It s a very inexpensive less than 20 dongle that plugs in to the OBD II port under your dashboard draws its power directly trom the car and converts the OBD ll specitic signals to serial over Bluetooth There are other OBD II scan tools on the market Some are just plain old cables to hook straight into a computer s RS 232 serial port and others are as fancy as full on bridges to a Wi Fi network And there are other manufacturers of Bluetooth OBD II scan tools but just make sure whatever you get is based on the WWW LINUXJOURNAL COM OCTOBER 2013 65 FEATURE Be a Mechanic with Android and Linux ELM327 chipset i Another piece of ae hardware you ll need is a tnterjace computer of some kind O0000 Any Linux powered laptop with Bluetooth will suffice but the form factor is kind of clunky when you re dealing with a cramped automotive cockpit See the Using a Laptop to Scan Your OBD II System sidebar if you want to use a laptop My personal preference is to use an Android device to interpret the signals coming trom the OBD II system in the car use a Nexus 7 tablet for this but any Android device should work I ve used a Motorola Droid RAZR and the very first HTC G1 Android phone for this as well Software wise my choice for this on Android is
108. ols like MongoDB Neo4j and Redis take innovative approaches to the unique problems of handling data in modern distributed and Web based systems The new book Making Sense of NoSQL A guide for managers and the rest of us by Dan McCreary and Ann Kelly is a resource for learning about NoSQL solutions According to publisher Manning Publications the book clearly and concisely explains the concepts features benefits potential and limitations of NoSQL technologies Using examples and use cases illustrations and plain jargon tree writing this guide shows how one can assemble a NoSQL solution to replace or augment a traditional RDBMS effectively After reviewing database concepts alongside the new NoSQL patterns authors McCreary and Kelly explore topics including Big Data search reliability business adaptability cloud computing large CPU count data centers and customized solutions Making Sense of NoSQL http www manning com Chris Strom s 3D Game Programming for Kids _ ae Pragmatic Programmers What s even better than playing games Creating your own of course And thus you shall be so empowered if you digest the contents of Chris Strom s new book 3D Game Programming for Kids Create Interactive Worlds with JavaScript Targeted at younger readers Strom s book illustrates how to create on line games Using nothing more than a browser and the language of the Web JavaScript readers will learn programming and
109. om here to there One way might be to take the Crutchfield approach and apply it to the Internet of Things Crutchfield built an unlikely business by betting that ordinary people could and would install high end stereos into their own cars if they had access to tools and instructions Crutchfield provided custom wiring harnesses that eliminated most of the complexity access to tools and comprehensive instructions from an exhaustive database of vehicle makes and models The bet paid off and it grew into a formidable player in the consumer audio business A similar model would work for Internet enabling dumb devices Assuming that you had the appropriate wiring harness a Wi Fi enabled Arduino or Digispark could be dropped into a washer dryer refrigerator or other appliance in minutes This could jump start the Internet of Things and most of the research could be crowdsourced There are business opportunities in performing the installations and in providing the code that sends and receives events from the devices INDEPTH and turns those into more complex behaviors Of course getting a data fabric into the home is a prerequisite so the installation of home automation servers cabling power over Ethernet and Wi Fi access points also will be a growth opportunity Stupid Cloud Tricks To seed your mind with ideas for Personal Cloud development imagine a world in which the most mundane objects and surfaces are smart an
110. ompletely free and completely awesome The application puts a big ugly ad on the screen of the phone but the remotely viewed video has no ads WWW LINUXJOURNAL COM OCTOBER 2013 49 COLUMNS Figure 2 This suction cup is an improvement over my original lean against the window design at all highly recommend using an old Android device instead of using an old iOS device if you happen to have the choice mounted the phone on the inside of my office window using a suction mount cradle designed for a car Figure 2 Viewing Both the iOS app and the Android 50 OCTOBER 2013 WWW LINUXJOURNAL COM app have a built in Web server that allows for direct viewing of the video stream Figures 3 and 4 The iOS application s interface is far less advanced than the Tree Android program but they both allow for either viewing the mjpeg video stream or a real time snapshot With the Android application which is What focus on from here out COLUMNS THE OPEN SOURCE CLASSROOM ipCam Links Note Some links may not be supported by all browsers Web Browser Links JPEG Video IDE tm tides MJPEG Video Raw Video Links JPEG Image MJPEG Video Figure 3 The IOS Web interface is functional but sparse because it s free Linux based and me however it wasn t enough far better the resolution of the wanted to view my bird feeders from full motion video is less t
111. on is based on your actual hard drive space If you ve ever wished your Dropbox data was hosted on your own servers or if you just don t have enough space check out OwnCloud It not only supplies file syncing but with its extendible infrastructure it also can do calendaring sharing and pretty much anything else you d want to do with cloud computing Check it out today at http www owncloud org SHAWN POWERS Surf Safely with sshuttle In past issues I ve explained how to set up a SOCKS proxy with SSH I ve demonstrated how to tunnel traffic with SSH I ve even shown how to circumvent a company firewall with SSH I ve never been able to use SSH completely as a VPN however and that s always bummed me out until discovered sshuttle Mind you sshuttle isn t a new program It isn t even a new concept What it is however is pure awesome Basically launching the sshuttle binary with root privileges will modity t UPFRONT your system firewall to tunnel all yes all traffic through a remote SSH connection The remote connection doesn t even need administrator privileges so your shell account at your Web host might suffice for securing your traffic in a hotel or coffee shop sshuttle will even tunnel your DNS lookups which means your entire network interaction should be secure and encrypted sshuttle is in many OS repositories or you can downloaded it from https github com apenwarr s
112. otive manufacturer had its own computer systems protocols connectors and trouble code definitions worked as a mechanic during the late 1980s and early 1990s and remember those systems well not fondly of course but well Some of those systems required you to do crazy things like jump a connector with a piece of wire then turn the key on and off three times and observe the Check Engine light as it flashed on and off You d have to count the number of flashes accurately and then look up the trouble code that flashed in a service manual and you might get a clue as to what was wrong with the vehicle Those early diagnostic systems made seasoned mechanics who were used to troubleshooting the machinery of an engine rather than its electronics shudder with trepidation Over time the manufacturers made the systems better The Society of Automotive Engineers made the connector protocol and trouble codes a standard in 1996 and with that we ve got the system in place today OBD II Onboard Diagnostics 2nd revision OBD II Basics Any car sold in the United States after 1996 uses the OBD II computer system so the majority of cars on the road today have this system Thanks to OBD Il s standardization and age lots of tools have been released to work with the system Because OBD II defines the connector and protocol that means you need both a hardware device to interface with the connector and some software t
113. ou don t need to know SCSS in order to AT THE FORGE use Foundation How can you use Zurb Foundation Download the package You have several options but the easiest one is to use the precompiled CSS files Go to the Zurb Foundation download site at http foundation zurb com download php and trom there click on the button for download Foundation CSS If you want to change the defaults you could download the SCSS version and do it that way Alternatively the good people at Zurb have provided a Web based selection system such that you can indicate what parts of Foundation you want as well as which colors and styles The CSS that you download then will be precompiled customized according to your needs If you download the simple CSS version and open the resulting zipfile a sample HTML page index html will be at the top level of the folders There also will be several subfolders whose names are fairly self explanatory js JavaScript css stylesheets and img images Looking at the HTML page you can see that Foundation is loaded in five steps 1 First you load the core Foundation CSS file lt Link rel stylesheet href css foundation css gt WWW LINUXJOURNAL COM OCTOBER 2013 27 COLUMNS AT THE FORGE Now this is definitely a long and I ve covered Modernizr in this column complex CSS file However remember before it allows you to test for certain that this defines all of the styles
114. ould consider that really cool Write to me at bharath you kKnow what lohray you know what com m Bharath Bhushan Lohray is a PhD student working on his dissertation on image compression techniques at the Department of Electrical and Computer Engineering Texas Tech University He is interested in machine learning and considers building a terminator the echelon of human advancement at least until we build the terminator POUT OPER PERU OPER CORODUORUOORUODUUUORUORODTORUUUORUORERUOROET Send comments or feedback via http www linuxjournal com contact or to Ijeditor linuxjournal com WWW LINUXJOURNAL COM OCTOBER 2013 103 INDEPTH The Personal Cloud The Personal Cloud gives you access and control over your own data and lets you do more with it than your vendors can Who wouldn t want that The question is how do we get there from here T ROB Personal What do you say when someone asks How much money do you make or How old are you or How much do you weigh or What is your address The quintessential response that s personal works because of an underlying assumption that we are within our rights to withhold that information and more important that privacy is the default and natural state of affairs There is no government procedure on reaching the age of majority requiring you to check boxes on an interminably long list enumerating all of the personal data attri
115. oundation provides So let s begin by putting the text inside a lt div gt with a class of row That shouldn t come as a surprise to anyone who has used Bootstrap or other CSS frameworks they often work this way and also use a row class to indicate that you re now enclosing one horizontal band of text The lt body gt without the Foundation specitic JavaScript thus will look like this lt div class row gt lt h1 gt Hello world headline lt hl gt lt p gt Hello world paragraph lt p gt lt div gt If you reload your browser you ll see that the text has moved closer to the WWW LINUXJOURNAL COM OCTOBER 2013 29 COLUMNS AT THE FORGE center of the page That s because using the row class has defined margins as well as allowed your content to be more centered and more responsive While you re at It make your window smaller At a certain point the text will make itself smaller changing on my computer at least from 2 75em to 2 15em The idea of course is that people with smaller browser windows still should be able to see as much text as possible and that the text should adjust itself proportionally Of course your sites generally will include more text than just Hello world I ll add some dummy text inside the paragraph so that it takes up a few lines But this time don t want the text to extend all the way to the right side Rather want it to take up only
116. partitions on your empty MicroSD card The first one is a VFAT partition of around 17MB for U Boot and the kernel image The rest will be used to store your root filesystem Mount the MicroSD card Take note of the device name your computer gives the MicroSD card Some computers recognize the card as dev sdX while others call it dev mmcblkxX for this example assuming that your card is recognized as dev sdb fdisk u sectors dev sdb H Type p to list the partitions inside the card If you have any WWW LINUXJOURNAL COM OCTOBER 2013 85 viper moblinux viper mobLinux S sudo fdisk dev sdb Command m for help p Disk dev sdb 3965 MB 3965190144 bytes 122 heads 62 sectors track 1023 cylinders total 7744512 sectors Units sectors of 1 512 512 bytes Sector size Logical physicaLl 512 bytes 512 bytes I O size minimum optimal 512 bytes 512 bytes Disk identifier Ox 0b7165 Device Boot dev sdbi dev sdb2 2048 34816 Command m for help Aj Start End 34815 744511 Blocks Id 16384 83 3854848 83 System Linux Linux Figure 7 List of Partitions on a 4GB MicroSD Card partitions at all listed delete them by pressing d Once the card is empty create a new partition by pressing n Make this the first primary partition fdisk is going to ask you for starting and ending sector numbers Type 2048 and 34815 respectively Repeat the process fo
117. people Lois McMaster Bujold The middle of the road is where the white line is and that s the worst place to drive Robert Frost The future will be better tomorrow Dan Quayle Some have been thought brave because they were afraid to run away Thomas Fuller Reading Is no substitute for action Colleen Wainwright WWW LINUXJOURNAL COM OCTOBER 2013 23 Dude Where s My Car Mt Pleasant 9 oMidland Muskegon 23 Grand Rapids O O Kentwood Hans INg Goda BAYE E Rogle Map data 2013 Googleg W Bluetooth Uconnect nae A Car dock Parking Sensor TA Notifications Auto Park My Car i 24 OCTOBER 2013 WWW LINUXJOURNAL COM JOURNAL When my family moved to Grand Rapids Michigan last year one of the biggest adjustments was dealing with city parking While we usually remember what side of the mall we parked on there was a time downtown that couldn t remember what parking garage we used much less what level or spot Thankfully had the parking ticket In my pocket which included the address for the particular parking lot we used Although we had to walk up 15 levels one by one to find the car at least we knew it was there somewhere If you ve ever walked around a parking lot wondering if you were the victim of theft or possibly going senile Valet is the perfect app for you It not only remembers the GPS location of your parked car
118. r bin identify scale 0 666 image 1 add input validation code height identify image cut d f3 cut dx f1 width identify image cut d f3 cut dx f2 newwidth echo width scale be cut d f1 newheight echo height scale bc cut d f1 echo lt img src image height newheight width newwidth gt exit In practical use scaledown sh pvp jpg 40 OCTOBER 2013 WWW LINUXJOURNAL COM lt img src pvp jpg height 646 width 207 gt That s easy enough With some creativity you can see how even just the identify command that s included with ImageMagick opens up a world of image file scripting possibilities whether you re working with Web sites directly or simply seek to analyze directories of images for unusual values or settings I ll dig into some of the really slick editing and modification capabilities including an easy way to add a so called watermark to your graphics along with ways you can automate fixing 300dpi resolution images or even scaling Images In an upcoming article As a final note although explain how you can take a large image and have it show up smaller on a Web page by using different values for height and width it would be remiss of me not to mention that if you re going to use only the smaller size it s smarter to resize the original image It makes your page faster to load less unneeded data is transferred and everything just generally is
119. r more robust Unfortunately that didn t solve my bandwidth issue THE OPEN SOURCE CLASSROOM My Flipbook Solution Although the VLC solution did work it didn t really fit my needs couldn t stream to the Internet due to lack of bandwidth and even if could my server could handle only a handful of clients before it petered out as well What ended up with as my final solution is rather elegant and very efficient You may recall said the Android application allows for high resolution Snapshots to be taken along with a direct video feed Rather than streaming video figured if took a high res photo every second could get a far better image and also save boatloads of bandwidth still wanted a video like experience so concocted a handful of scripts and learned some JavaScript to make a sort of Tlipbook video stream on a regular Web page This was a two part process had to get constantly updated photos plus had to build a Web page to display them properly Step One Getting the Photos My first instinct was to use a cron job to fetch photos regularly from the Android phone Because cron jobs run only every minute dismissed my first plan right away didn t need full motion video but One Frame Per Minute is pathetic by any standard WWW LINUXJOURNAL COM OCTOBER 2013 53 COLUMNS THE OPEN SOURCE CLASSROOM Listing 1 bird_update Script bin bash while true do
120. r the second partition This time just press Enter when asked for starting and ending sector numbers fdisk will use the default 86 OCTOBER 2013 WWW LINUXJOURNAL COM values which will fill the remainder of the card Type p again to list the partitions You should see something like what Is shown in Figure 7 Type w to write the changes permanently onto the card Now create the two filesystem types on the partitions mkfs vfat dev sdbl mkfs ext3 dev sdb2 Don t forget to do the sync after every command you type for the MicroSD card Sync ensures that the changes are flushed and keeps the card in the correct state Next mount the partitions am assuming the mountpoints are media card1 for dev sdb1 and media card2 for dev sdb2 First populate the root filesystem and copy the kernel modules onto the first partition cd media card2 tar xzvf home user Al13System my rootfs tar gz sync THIS WILL TAKE SOME TIME cp a KERNEL_DIR out 1ib modules 3 4 43 1ib modules sync Copy the ulmage Tile from your kernel directory in arch arm boot to the first partition along with a Tile called script bin script bin stores the system configuration settings necessary for Allwinner chips If you want to edit these settings convert this bin file into a tex file using a tool called bin2fex You can edit the resulting file with any text editor For the last step you need
121. rial terminal worked after that Setting aside the cost of the board a board failure at a critical time during a project is catastrophic It you do not have a backup board After losing the BeagleBoard hit upon the idea to load my bare metal code over the LAN via bootp and TFTP and leave the board untouched This not only reduced the risk of mechanically damaging my board but it also Improved on my turn around times no longer needed to copy files to the SD card and move it around In this article present a briet introduction to U Boot and then describe the necessary configurations to set up a development environment using DHCP and TFTP The setup present here will let you deploy and test new builds quickly with no more than rebooting the board use the BeagleBone Black http beagleboard org Products BeagleBone 20Black as the target platform and Ubuntu as the development plattorm for my examples in this article You may however use the methods presented here to work with any board that uses U Boot or Barebox as its Stage 2 bootloader U Boot U Boot is a popular bootloader used by many development plattorms It supports multiple architectures including ARM MIPS AVR32 Nios Microblaze 68K and x86 U Boot WWW LINUXJOURNAL COM OCTOBER 2013 91 FEATURE A Handy U Boot Trick U Boot is a pretty advanced bootloader that is capable of loading the kernel and ramdisk image from the NAND SD card USB d
122. rive and even the Ethernet via bootp DHCP and TFTP Listing 1 The Serial Console Output from the Stage 1 Bootloader U Boot SPL 2013 04 rc1 14237 g90639fe dirty Apr 13 2013 13 57 11 musb hdrc ConfigData Oxde UIMI 8 dyn FIFOs HB ISO Rx wHB ISO Tx SoftConn musb hdrc MHDRC RTL version 2 0 musb hdrc setup fifo mode 4 musb hdrc 28 31 max ep 16384 16384 memory USB Peripheral mode controller at 47401000 using PIO IRQ 0 musb hdrc ConfigData Oxde UIMI 8 dyn FIFOs HB ISO Rx wHB ISO Tx SoftConn musb hdre MHDRE RTL version 2 0 musb hdrc setup fifo mode 4 musb hdrc 28 31 max ep 16384 16384 memory USB Host mode controller at 47401800 using PIO IRQ 0 OMAP SD MMC mmc send cmd timeout No status update reading u boot img reading u boot img has support for several filesystems The U Boot project also includes as well including FAT32 ext2 ext3 the x loader The x loader is a small ext4 and Cramfs built in to it It also stage 1 bootloader for ARM Most has a shell where it interactively modern chips have the ability to read can take input from users and it a FAT32 filesystem built in to the Supports scripting It is distributed ROM The x loader loads the U Boot under the GPLv2 license U Boot isa into memory and transfers control stage 2 bootloader to it U Boot is a pretty advanced 92 OCTOBER 2013 WWW LINUXJOURNAL COM X Loader MLO Load U Boot uboot bin Wait for user interruption
123. rned about the file command It can be helpful with some file types file wp content tar gz wp content tar gz gzip compressed data from Unix But the command is generally useless with images file pvp jpg pvp jpg JPEG image data EXIF standard Um what about image size How about any useful info at all Jeez Enter the ImageMagick identify command identify pvp jpg pvp jpg JPEG 970x311 DirectClass 114kb 0 010u 0 01 Ahh so this particular image has the dimensions the suite refers to dimensions as the geometry of the image of 970x311 That s useful Do you want even more information though The verbose option spits out a somewhat overwhelming amount of data identify verbose pvp jpg Image pvp jpg WORK THE SHELL Format JPEG Joint Photographic Experts Group JFIF format Geometry 970x311 Class DirectClass Colorspace RGB Type TrueColor Depth 8 bits Endianess Undefined Channel depth Red 8 bits Green 8 bits Blue 8 bits Channel statistics Red Min Max 255 Mean 180 72 Standard deviation 74 2122 Green Min Max 255 Mean 168 593 Standard deviation 76 0343 Blue Min Max 255 Mean 169 459 Standard deviation 77 244 Colors 21864 Rendering intent Undefined Resolution 72x72 Units Undefined Filesize 114kb Interlace None Background Color white Border Color DFDFDF WWW LINUXJOURNAL COM OCTOBER 2013 37 COLUMNS WORK THE SHELL
124. s also can advertise to the world should wish some or all of what Say about those products in my cloud Or can restrict what I say just to the companies invite into a relationship such as the ones above Likewise any company such as Canon LaCrosse Sangean and Garmin can give every product it sells a unique cloud of its own with its own QR code and transfer ownership of that cloud to the customer along with the product itself If the customer welcomes a relationship with the company and the company agrees to the customer s terms of engagement such as respect the privacy of this communication channel in the following ways the whole own cycle of a product becomes a much richer experience for both the customer and the company The QR code then becomes what s called a TalkTag meaning that its purpose Is to serve as a way for the customer to signal his or her interest in talking to the company For example can program the cloud of my Dish Network set top box to make a scan of its QR code send a message to the company saying I d like a call trom an agent to helo me work through a problem I ve talked to call center people about this possibility and they love it What they love especially is that it s now possible to have a standard way for customers to relate to companies The problem today is that every company s CRM customer relationship Advertiser Index Thank you as always
125. scene from The Karate Kid the original from 1984 sorry I m old is when Mr Miyagi stops the Cobra Kai sensei John Kreese trom beating up his defeated student Miyagi is a small teeble looking old man and he has no need to prove to anyone that he s an awesome warrior Linux is much the same awesome and unassuming Linux is slowly but surely taking over the world embedded into cell phones televisions wristwatches and server rooms Because Linux itself isn t a commercial entity it doesn t need to be flashy and it doesn t need to brag When it comes to embedded systems Linux is honking the nose of proprietary alternatives just like Mr Miyagi does to the bully We start out our Embedded issue with Reuven M Lerner s column This month Reuven explores an alternative to the extremely popular Twitter Bootstrap Zurb Foundation may sound like a character from Starcraft but in fact it s a competitor to Twitter Bootstrap that is worth a look Kyle Rankin takes the path less traveled as well this month with his solution to 8 OCTOBER 2013 WWW LINUXJOURNAL COM SHAWN POWERS the Google Reader shutdown One of the things love about Linux is that there s no single way to do anything While want a bookmark to take me from RSS site to RSS site Kyle shows us to have articles delivered via e mail If that sounds interesting to you check out his column this month for instructions on how he does i
126. shuttle With a simple sudo sshuttle dns vvr username server 0 0 all your traffic will be encrypted and funneled through the remote server Because DNS also is tunneled it means you won t be vulnerable to DNS poisoning either Check out sshuttle today You won t be sorry SHAWN POWERS WWW LINUXJOURNAL COM OCTOBER 2013 17 t UPFRONT Mapping Your GIS Data I ve already looked at some GIS package management systems If applications available on Linux not you always can download the Programs like GRASS and qgis sources and build it trom scratch provide a full set of tools to do It does depend on Python among GIS Sometimes that s really several other libraries so you overkill though You may just want need to do a bit of a dependency to display some data geographically dance Binary downloads even are and create a map For those cases available for Windows and Mac there is Thuban an interactive OS X sO you can point your geographic data viewer non Linux friends to them http thuban intevation org If you don t already have data Most distributions should have of your own sources of public a package available within their domain GIS data are available Thuban unnamed map Figure 1 Starting Thuban gives you a blank slate 18 OCTOBER 2013 WWW LINUXJOURNAL COM t UPFRONT on line Here are a couple simply grabbed several of the data http www naturalearthdata files available on line
127. sonal Cloud directions are listed below The strategy for deriving these is to imagine a future state where privacy is baked into the architecture and where sharing is enabled by policy This is the opposite of today s model where the architecture is built for Sharing and privacy is provided by policy Also assume a future state where Individuals have access to all the transaction data their vendors currently collect and to the data from all their devices and that all of this is accessible to the user in aggregate through their Personal Cloud Software Extend Supply Chain management systems all the way to the consumer so that the merchant Is the next to last rather than the last stop in the chain The opportunity here is to create the API of Me and My Things and to assist large Enterprise to understand the value in integrating with it Considerable momentum already exists in Vendor Relationship Management applications the consumer counterpart to Customer Relationship Management In short re imagine business software as owned and operated by and for the individual There are a number of initiatives and groups working to provide infrastructure and resources to further these concepts The unsurprisingly named Privacy By Design framework advances the view that the future of privacy cannot be assured solely by compliance with legislation and regulatory frameworks rather privacy assurance must become an organization s
128. sources on your system can t find a way to make Windows behave this way on its own so although Launchy is cross platform it probably will be the most usetul for Windows users You can download your copy today at http www launchy net SHAWN POWERS WWW LINUXJOURNAL COM OCTOBER 2013 15 t UPFRONT Own Your Data with OwnCloud Fi lt p ER C OL a Personal New t TE Idea Journal Prodigy Stinger Test T Writing Topics oct love Dropbox really do With a Google AdWords campaign and 50 or so was able to max out my free storage That means have around 24GB of free Dropbox storage to fiddle with Granted that s a lot but in the grand scheme of things 24GB isn t very much space During the past few years I ve mentioned several alternatives like SparkleShare but the new kid on the block OwnCloud Is a Web based application that provides a plethora of cloud based services The most popular is its file syncing Setting up OwnCloud isn t for the 16 OCTOBER 2013 WWW LINUXJOURNAL COM faint of heart as it requires some PHP tweaking and really should be SSL encrypted but for anyone comfortable with configuring LAMP applications it s not insurmountable Once your server is installed there are native syncing applications tor Windows OS X Linux Android and iOS Because OwnCloud is hosted on your own server your space limitati
129. t Dave Taylor and have a little crossover with our columns this month which is completely coincidental but very aptly timed Dave explores the power of the ImageMagick suite of tools used in scripting follow later in the magazine with my column describing my homemade streaming Webcam of BirdTopia or Backyard as others refer to it use some ImageMagick tools to manipulate the images pulled from my cell phones all from scripts on my Linux server I ve enjoyed creating my BirdCam setup more than most of my Linux projects and hope it inspires you to try something similar The truly embedded portion of this issue starts with Bill Childers and his article on interfacing with your vehicle s OBD system Using Android and a fancy dongle Bill explains how to get diagnostic information directly from your car If your Check Engine light suddenly pops on but gives no reason as to why Bill s article will be extremely helpful Ronald Kurniawan goes one step deeper and shows how to use an 80 embedded system from Olimex to create a desktop system or even a complete server Proving there s more to the tiny embedded world than just Raspberry Pi devices Ronald walks through the entire process for getting a system running Most new embedded systems take advantage of the U Boot system for starting up Bharath Bhushan Lohray covers U Boot and some of its features along with a few tricks Whether you need to
130. t lt gt Generic Target Core Mod TCM and ConfigFS Infrastructure v lt Exit gt lt Help gt Figure 3 Selecting Misc Devices under Device Drivers WWW LINUXJOURNAL COM OCTOBER 2013 79 viper moblinux OLINUXINO al3micro sunxi 3 4 config Linux arm 3 4 43 Kernel Configuration al Arrow keys navigate the menu lt Enter gt selects submenus gt Highlighted letters are hotkeys Pressing lt Y gt includes lt N gt excludes lt M gt modularizes features Press lt Esc gt lt Esc gt to exit lt gt for Help lt gt for Search Legend built in excluded lt M gt module lt gt Wireless LAN lt gt USB ZD1201 based Wireless device support Enable WiFi control function abstraction lt gt Broadcom 4329 30 wireless cards support lt M gt Broadcom 4330 wireless cards support lt gt IEEE 802 11 for Host AP Prism2 2 5 3 and WEP TKIP CCMP By 8192C USB WiFi for SW lt M gt Realtek 8188E USB WiFi lt gt Realtek 8189E SDIO WiFi lt gt Realtek 8723A SDIO WiFi v lt Exit gt lt Help gt Figure 4 Realtek 8192C Driver as a Module viper moblinux OLINUXINO al3micro sunxi 3 4 config Linux arm 3 4 43 Kernel Configuration Linux arm 3 4 43 Kernel Configuration Arrow keys navigate the menu lt Enter gt selects submenus gt Highlighted letters are hotkeys Pressing lt Y gt includes lt N gt excludes lt M gt modularizes features Press
131. ted created a simple HTML the live image added this extra file with an img tag and could see my step because if convert stores bird feeders from anywhere In order directly to the final filename it to get a refreshed image however gets displayed as a corrupt image had to refresh the entire Web page It it the Web server tries to serve worked but it was ugly had to reach it out during the conversion out for some JavaScript help process The mv command is almost Before getting to the final HTML instantaneous so haven t seen file it s Important to explain that any weird corruption after adding while getting JavaScript to refresh a the extra step single image on a page isn t terribly difficult browsers are designed to I m almost embarrassed to admit cache as much as possible so making WWW LINUXJOURNAL COM OCTOBER 2013 55 COLUMNS THE OPEN SOURCE CLASSROOM Listing 3 birds html lt DOGIYEE Atm PUBLIC W3C DTD XATME O Transitional EN http www w3 0org TR xhtml11 DTD xhtml1 transitional dtd gt shtml xmlns http www w3 0rg 1999 xhtml gt lt head gt Ale The Birds Or irene sy ide e gt lt script type text javascript gt refreshImage function img document getELementByld cam img src http example com birds jpg rand Math random lt Sen 1 pte lt meta http equiv Content Type content text html charset 1s0 8859 1 gt lt head gt lt body onload
132. tion Binary Interface It specities the low level conventions for embedded software application When it comes to Arm microcontrollers they come in many sizes ranging from very small to large The smaller variants don t have the necessary memory or power to process floating point computation on the hardware itself thus making it WWW LINUXJOURNAL COM OCTOBER 2013 75 FEATURE Create a Mini PC or Server with Olimex s Olinuxino A13 A13Micro necessary to do it by software These variants are called Arm soft float There are other variants that can process the floating point calculation by hardware like vector floating point vtp These two EABIs soft float and vfp are what is usually known as armel A newer EABI that targets the higher end of Arm microcontrollers with more efficient floating point instructions than vfp is called hard float thus armhf Olimex s A13WiIFI A13 and A13Micro boards are powered by the Allwinner A13 Arm microcontroller which are based on ARMv design ARMv 7 as with the newer ARMV8 fully supports armhf Prerequisites You can find all the necessary URLs for file downloads and other information in the Resources section of this article You need to install the following programs before you can commence the build process E build essential E gcc 4 6 arm linux gnueabiht the version might vary from one distro to another the latest came across at the time of this writing is vers
133. to write U Boot onto the card itself Pay extra attention to what you type here as you are not going to write to dev sdb1 or dev sdb2 but to dev sdb cd home user A13System u boot dd if spl sunxi spl bin of dev sdb bs 1024 seek 8 dd if u boot bin of dev sdb bs 1024 seek 32 sync Now your MicroSD card is ready to use First Run Plug in the card in the slot on the board Also plug in the Wi Fi USB Stick a keyboard and the VGA monitor use a USB hub if you have to Plug in the power cord and wait for the login prompt Log in with the root account You shouldn t need a password for the first run After you get in set a secure password for your root account and create another account for your daily use Put this new user into the sudoers file Check whether you have network connectivity Test the board remotely by connecting to it via SSH If you can do all that successtully congratulations You have a great minimalist PC server at your disposal WWW LINUXJOURNAL COM OCTOBER 2013 87 IF YOU ARE INTERESTED IN USING THIS BOARD WITH A GRAPHICAL USER INTER FACE BECAUSE THE BOARD DOES NOT HAVE MUCH RAM TO SPARE Nindow Manager Contiguration ynfiguration Focus Model 3 Eh z Max e 4 lt Workspace 1 gt 25 jul Thu 11 13 22 Figure 8 Al3Micro Running Fluxbox 88 OCTOBER 2013 WWW LINUXJOURNAL COM Desktop Environment If you are interested in using this board wit
134. to fall These applications radically transtormed commerce on a global scale when they were Tirst built out by large enterprises We have the opportunity to transform commerce again with even greater impact by building out business functionality on the consumer side Or we could continue to focus on making better versions of Angry Birds and moving light switches from the wall to the phone Today s architecture in which vendors have all the data and computing power is a dying relic left over from a world where computing was specialized and so expensive that only large businesses could afford it It is the cable car wheelhouse or the big motor out back behind the factory But in a world of cheap and abundant computing power individuals are the natural points of integration for their own data Now we have the choice to continue on with the legacy model or to move to a new model in which the individual s computing capacity improves the experience of both the individual and the vendor Having all that computing power on the consumer side and not building out new business integration seems to me to be akin to ripping the motors out of INDEPTH all the disk drives DVD players clocks refrigerators and other appliances and equipping them with belts and pulleys You could do it but it doesn t scale and you won t like the experience Impersonal Clouds Let s revisit that cloud database filled with information about you
135. tting the necessary packages to create a comfortable minimal computing environment At the end of this article also explain how to Install a compact desktop environment am using Ubuntu 12 04 Precise Pangolin for my build system Any Debian based system users should be able to follow the instructions in this article with relative ease Before you begin you should create a directory under your home directory to contain all your work am going to call mine A13System What Are Arm and eabihf As you progress further into the article you will encounter the terms Arm and eabihf more than once Let me clarify those terms in order to avoid confusion with other terms that you might encounter if you decide to go further into the world of cross compllation Arm is a general name for a family of microcontroller architectures designed by ARM Holdings a British company You can find Arm microcontrollers inside most portable modern gadgets ranging trom mobile phones Nintendo DS portable game consoles to Apple iPhone and Apple TV ARM Holdings does not manufacture these microcontrollers rather it licenses the designs to other companies These companies then add their own secret recipes into the designs and then manufacture and sell the finished microcontrollers This is why there are so many variants of Arm architecture and so many companies that produce Arm microcontrollers EABI stands for Embedded Applica
136. turns out that streaming multiple video feeds will saturate Video Is for Chumps that type of bandwidth very quickly Well it s Tor chumps with insane also had the problem of taxing bandwidth anyway Although my the embedded Web server on the business Internet connection here phone with more than one or two 52 OCTOBER 2013 WWW LINUXJOURNAL COM COLUMNS connections still hadn t given up on full streaming so my first attempt at Global BirdCam was to re encode the phone s video on my Linux server which would be able to handle far more connections than an old Android handset Thankfully VLC will run headless and happily rebroadcast a video stream Getting just the right command line options to stream mjpeg properly proved to be a challenge but in the end this long one liner did the trick cvlc http PHONE IP 8080 videofeed sout std access http mime multipart x mixed replace boundar y b3cc56e5f51db803 f790dad 720ed50a mux mpj peg dst 0 0 0 0 2000 The cvic alias just starts VLC headlessly The mime and boundary stuff took the longest to figure out Basically had to get that right or Web browsers would just try to download a file instead of playing a stream This method did work actually and could connect multiple clients to the server on port 2000 and get the remuxed stream without overtaxing the phone The phone served out only the single feed to the server and the server is fa
137. ubsystem before attempting any network based boot If your development board does not hold a Flash memory on board it may not have a MAC address either In this case you will have to set a MAC address before you can issue any network requests You can do that by setting the environment variable ethaddr along with the rest of the UENv txt script An alternative but cumbersome way to change the default boot sequence is to modity the U Boot source code Modifying the source code gives you greater versatility for booting your development board When you interrupt the U Boot boot sequence drop to the U Boot shell and issue the env print command you ll see a lot of environment variables that are defined by default These environment variables are defined as macros in the source Listing 9 Part of the u Boot include configs am335x_evm h File Responsible for the Default Script in the bootcmd Variable define CONFIG BOOTCOMMAND mmc dev mmcdev if mmc rescan then echo SD MMC found on device mmcdev It une toadbeeteny then a echo Loaded environment from bootenv r n importbootenyv A eae AN if test n uenvcmd then echo Running uenvcmd run uenycmd N EMA N if run Loaduimage then run mmcboot wfo N 102 OCTOBER 2013 WWW LINUXJOURNAL COM w N code Modifying the source code aims at modifying these variables As shown in Figure 1 U Boot begins loading t
138. ug 08 World News 18712 N Aug 08 Hack a Day Josh Mar rE1ng Ihe myth of the UX designer Swedish Pirate Party reports IT minister to the police after she was spotted infringing copyright online on a Super chez ing your dl tal calipers eho HN R he ee eee ee ee een eine e and Clacier now HN Raw mage Storage notogr ni t gt and GI Li l e Figure 1 RSS Feeds inside Mutt was from By default mutt sets the index_format to set index_format 4C Z b d 15 15L 41 s So set up a folder hook so that when I m in the rss mailbox get a slightly tweaked index folder hook rss set index_format 4C Z b d 20 20f s The main change made was to remove the column that displayed the size of the message 4l and had it display the complete FROM line of the e mail and gave myself a little extra room in that column 20 20f The result is a much more readable feed list as you can see in Figure 1 Although it s true that miss out on images within my news feeds in many cases that just means miss out on ads or clipart When I run mutt from a machine with a Web 46 OCTOBER 2013 WWW LINUXJOURNAL COM browser and view the HTML it opens the e mail inside the Web browser and from there can view images if want For those feeds that post only a summary of the article can follow the hyperlinks to the main article and read it in full Viewing my news this way may not appear
139. ur x86 64 bit systems You also need to mount the host s proc filesystem into your chroot system When you Tirst get inside the chroot system you might find a strange prompt greeting you I have no name This is not a cause for concern and you can safely disregard It Once you are inside your chroot system execute another call to debootstrap to complete the base system with second stage If you are curious whether you really are running an armhf system within your chroot system issue the uname command to check If you see something like armv somewhere in the output it Is an indication that your chroot is running the armhf system The next step is to update your apt source list file Within your chroot system or using the build host s editor go and edit the file etc apt sources list that resides inside your root filesystem directory Add the following lines to this file remember you can use other Debian repositories as well deb http ftp debian org debian wheezy main contrib non free deb src http ftp debian org debian wheezy main contrib non free deb http ftp debian org debian wheezy updates main contrib non free deb src http ftp debian org debian wheezy updates main contrib non free deb http security debian org wheezy updates main contrib non free deb src http security debian org wheezy updates main contrib non free Preparing the Filesystem Ubuntu
140. urnal cor FREE e NEWSLETTERS Linux Jol editors publish newsletter a weekly and monthly bas late breaking news technical t tricks an inside look at upco and links to in depth stories f http www linuxjournal c for free today http www linux enewsletters ADVERTISING Linux Journal is a resource for readers and adver Request a media kit view ot editorial calendar and advert or learn more about other a and marketing opportunitie us on line http ww linuxjourna advertising Contact us directly fo information ads linuxjournal c 1 713 344 1956 ext 2 WWW LINUXJOURNAL COM OCTOBER 2013 13 UP diff u There recently was a flame war on the linux kernel mailing list that got some attention outside the kernel community It started when Greg Kroah Hartman complained that people were sending patches for the stable series that didn t belong there and Linus Torvalds suggested he learn how to yell at people more then Sarah Sharp said that Linus shouldn t be advocating abuse It turned out to be an interesting culture clash Sarah posed her argument as Violence whether it be physical intimidation verbal threats or verbal abuse is not acceptable Keep it professional on the mailing lists And In karate or any other sport if your opponent is motionless on the floor you stop You can t see the person you re emailing You can t see If the first conversation disabling blow has completely knock
141. visualize cool 3 D results as they type To make things easier for beginners the kid friendly ICE Code Editor was created especially for this book Want a red donut Make hundreds of them spinning around like crazy right next to the entered code Readers can create games quickly by focusing on the project based lessons If they want to go further and understand the theory or mathematical functions they can turn to the chapters that explain the programming concepts http www pragprog com WWW LINUXJOURNAL COM OCTOBER 2013 61 NEW PRODUCTS Directory Wizards Inc s UnitySync Directory Wizards Inc SOLUTIONS FOR YOUR DIRECTORY NEEDS Into the big Linux tent we welcome Directory Wizards whose UnitySync solution is now available on the Linux platform UnitySync is a centralized service that synchronizes data between directories so that organizations enjoy a unitied view of their disparate directories Our sources at Directory Wizards say that UnitySync can scale from small directories with hundreds of objects to enterprise directories consisting of hundreds of thousands of objects without requiring extensive training or installation configuration time UnitySync users can synchronize account information between different directories so that each directory contains a unitied view of the other non connected directories In addition users can define authoritative data sources enabling one system to update Individual attributes o
142. with the basic assumption that if you re using the command line you re focused on text That s not always true and if you work with images at all whether JPEG PNG GIF or another tormat there s a free to download suite of image related utilities available that offers rather amazing capabilities direct from the command line and therefore also from within shell scripts I m talking about ImageMagick a set of programs that has grown and expanded through the years and now includes powerful Perl and Ruby interfaces too But oshaw We don t need no stinkin Perl or Ruby We ll stick with our 36 OCTOBER 2013 WWW LINUXJOURNAL COM hard core shell commands thank you very much You ll tind a downloadable binary and source both at http www imagemagick org and as always recommend you download source and compile it on your system if you can It s far more reliable than hoping someone else s compiled version is optimized for your own hardware configuration A variety of different commands are included with the ImageMagick distribution that divide into analysis and editing tools For this article let s stick with the analysis tools Let me start by showing you how much more information it offers on a typical image Tile than the standard Linux command line COLUMNS Analyzing Images for Non Optimized Resolutions If you ve been using Linux for even a short time you ve probably lea

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