CIS 90 - Lesson 11
Contents
1. home cis90 roddyduk edits type spell spell is hashed usr bin spell home cis90 roddyduk edits file usr bin spell usr bin spell Bourne shell script text executable home cis90 roddyduk edits cat usr bin spell bin sh aspell list mimicks the standard unix spell program roughly OK the actual cat SE list mode none sort u RSS command is aspell home cis90 roddyduk edits 89 CIS 90 Lesson 11 REI spell command ASPELL 1 Aspell Abbreviated User s Manual ASPELL 1 NAME aspell interactive spell checker SYNOPSIS aspell options command DESCRIPTION aspell is a utility that can function as an ispell a replacement as an independent spell checker as a test utility to test out Aspell features and as a utility for managing dictionaries COMMANDS command is one of help display the help message c check file to spell check a file There must be a way to add CIS but lets try google 90 CIS 90 Lesson 11 ee ee Q X MIS ven vent ete 20085102 oett roam prs met docta Md Bo p D Cuatir SS coter CU Ferr E beper Gema J Macarena Oiar Peer Tesi ii Ven eurn a 00 Samat Jain s personal home page Semang that has bothered me forever a that applcamons that use AA sod fer spat checdong kept martang my name as every Em belang at you Mad Mest front and applications don t proie may for you to eb services a2. 20 Ces CIS 90 Lesson 11 FE l pu Tangent on Dg and SIGCONT CIS 90 Lesson 11 Running process gets a What is signal 18 ee lt s CIS 90 Lesson 11 E E 11 iii Signals SIGSTKFLT 16 Stack fault SIGCHLD SIGSTOP SIGTSTP SIGTTIN SIGTTOU SIGURG SIGXCPU SIGXFSZ 17 Child process has sto ed or exited changed POSIX 19 Stop executing can t be caught or ignored POSIX 20 Terminal stop signal POSIX Ctrl Z or Ctrl F 21 Background process trying to read from TTY POSIX 22 Background process trying to write to TTY POSIX 23 Urgent condition on socket 4 2 BSD 24 CPU limit exceeded 4 2 BSD 25 File size limit exceeded 4 2 BSD SIGVTALRM 26 Virtual alarm clock 4 2 BSD SI GPROF 27 Profiling alarm clock 4 2 BSD SIGWINCH 28 Window size change 4 3 BSD Sun SIGIO SIGPWR 29 O now possible 4 2 BSD 30 Power failure restart System V Signal 18 continues a stopped process isn t that what bg does 110 CIS 90 Lesson 11 4 nil The bg command is used to resume a stopped process home cis90 roddyduk sleep 60 Ctrl F or Ctrl Z typed here 1 Stopped sleep 60 home cis90 roddyduk bg 1 sleep 60 amp home cis90 roddyduk jobs 1 Running sleep 60 amp home cis90 roddyduk jobs 1 Running sleep 60 amp home cis90 roddyduk jobs 1 Done sleep 60 home cis90 roddyduk bg resumed the stopped p
3. ps command from bash PPID 6204 PID 6204 PID 6204 PPID 6203 PPID 6203 rsimms opus ps 1 UID PID PPID C PRI rs F S NI ADDR SZ WCHAN TTY 0S 201 6204 6203 0 75 OR TIME CMD 0 1165 wait pts 6 00 00 00 bash 201 ESS 6204 0 77 0 1050 pts 6 00 00 00 ps 2 An exec system call is issued to overlay the child process with the instructions of the requested command The new instructions then are executed 27 The parent process issues the wait system call and goes to sleep DRE Parent and child process practice Type bash Type bash again Type bash again Type ps I Who is the parent of ps Who is the parent of the parent of ps Type ps ef Track your family history as far back as you can go Who is the most distant grandparent of ps qm F s Review of Signals CIS 90 Lesson 11 PLATE 4 COMMERCIAL CODE SIGNALS EXAMPLES OF THE BMVEMAL MOISTS ase a AS RAVENS TWO TERED OR FOUR wont vot EH pd rur begin e bs im is Pad riri ani cn iie SUETON ant bagi ee tais e 6 Bat URGENT IMPORTANT SIGNALS COMPASS S ONALS Cope Fia oven Pias on 2 Fina Sionais TE iy Do Aor L 110 NAL A E nes Co pne Left tum JAMES BROWN GLASGOW CIS 90 Lesson 32 AE EB BE 0 A process reads from stdin writes to stdout puts error messages in stderr and may get interrupted from time to time by a signal A process is a p
4. Use ps If to get their PIDs Resume one job with the bg command e Resume the other job with the kill 18 signal e Use jobs to see if they complete 113 CIS 90 Lesson 11 LEE 11 pw vi practice e Bring up the vi reference page at http simms teach com docs vi ref html Create a directory called practice mkdir practice Copy in sample text files cp home cis900l depot practice 114 CIS 90 Lesson 11 Wee Kk ru Vi Practice using these commands Note to execute any of the following commands from vi you must be in command mode Press the Esc key to enter command mode h moves the cursor one character to the left j moves the cursor down one line k moves the cursor up one line I moves the cursor one character to the right w moves the cursor one word forward b moves the cursor one word back O zero moves the cursor to the beginning of the line moves the cursor to the end of the line G moves the cursor to the last line in the file 1G moves the cursor to the first line in the file 105G moves the cursor to line 105 d scrolls down 10 lines u scrolls up 10 lines f page forward one page b page back one page Try typing a number in front of these commands and notice what happens CIS 90 Lesson 11 un E 11 ru vi Now practice these commands Note to execute any of the following commands from vi you must be in command mode Press the Esc key to enter command mode q e
5. dw Deletes the current word dd Deletes the current line D Deletes to the end of the line yy Copies a line to the clipboard buffer p Pastes whatever is in the clipboard buffer below the current cursor P Pastes whatever is in the clipboard buffer above the current cursor 118 CIS 90 Lesson 11 ER 11 ru vi Now practice these commands Note to execute any of the following commands from vi you must be in command mode Press the Esc key to enter command mode g Tells you the filename you are editing and what line your cursor is on u Undoes the last command you executed Repeats the last command you executed string Searches for the string of characters in the file n Finds the next occurrence of the current search string looking down the file N Finds the next occurrence of the current search string looking up the file Changes the case of the current character 119
6. 00 sleep 8280 pts 1 00 ps home cis90 simmsben S E E The same thing happens again another day This time We Benji does not care what happens with app CIS 90 Lesson 11 Be Signals nji runs app EP simmsben opus cie 98 998 FERREE FEFFE FFFFFFF E LE E 5 B E E FF FFF HEHHE z amp E 5 E E 4 A L wise i HEHHE EH sains 1 H nii home cis90 simmsben ps u simmsben one PID TTY CMD two 6657 sshd thrKilled 6658 pts i bash home cis90 simmsben S Jj 7033 7034 8237 8279 8280 pts 2 pts 2 pts 2 pts 1 sshd bash app sleep home cis90 simmsben S home cis90 simmsben S So he sends a SIGKILL this time and app never even sees it coming poof app is gone 22 AQU CIS 90 Lesson 11 LR I p Review of Job Control CMe Peg CIS90 Lessonit MIN Job Control A feature of the bash shell amp Append to a command to run it in the background bg Resumes a suspended job in the background fg Brings the most recent background process to the foreground jobs Lists all background jobs Use amp to run any command or script in the background CIS 90 Lesson 11 22 11 ru amp Append to a command to run it in the background Example 1 home cis90 simmsben find user 1200 2 duh sort huh C 99 No prompt For long running commands or scripts you must wait for
7. CIS 90 Lesson 11 Job Control Managing jobs home cis90o1 simmsben bg 2 2 sleep 110 amp home cis9001 simmsben jobs 1 Stopped Sleep 120 ERE Jobs can be resumed E eus in the background Sleep 100 b nth home cis9001 simmsben bg 1 USING Dg or iU e 1 sleep 120 amp foreground using fg home cis9001 simmsben jobs sleep 120 amp 2 Running sleep 110 amp 3 Stopped Sleep 100 home cis900l simmsben fg3 sleep 100 At this point we lose control of the keyboard again until sleep 100 is finished d CIS 90 Lesson 11 Job Control Managing jobs home cis9001 simmsben jobs 1 Done sleep 120 Background jobs are 2 Done all done sleep 110 65 Milk Job Control e Run and suspend two jobs sleep 125 Ctrl F or Ctrl Z sleep 120 Ctrl F or Ctrl Z Use jobs to see them Resume one job with the bg command Use jobs to see change Bring the other to the foreground with fg e Use jobs when control returns to see that every process finished e Use sleep 15 amp to run in the background Use jobs to check on progress L 1 be Review of Load Balancing CIS 90 Lesson 11 LEE 11 ru Load Balancing The at command reads from stdin or a file for a list of commands to run and begins running them at the time of day specified as the first argument 9 cat JObL cp bin myscript bin myscript bak at 10 30pm lt jobl This will run the cp command
8. E EB BE 0 Signals SIGSTKFLT 16 Stack fault SIGCHLD 17 Child process has stopped or exited changed POSIX SIGCONT 18 Continue executing if stopped POSIX SIGSTOP 19 Stop executing can t be caught or ignored POSIX Ctrl Z or Ctrl F SIGTTIN 21 Background process trying to read from TTY POSIX SIGTTOU 22 Background process trying to write to TTY POSIX SIGURG 23 Urgent condition on socket 4 2 BSD SIGXCPU 24 CPU limit exceeded 4 2 BSD SIGXFSZ 25 File size limit exceeded 4 2 BSD SIGVTALRM 26 Virtual alarm clock 4 2 BSD SIGPROF 27 Profiling alarm clock 4 2 BSD SIGWINCH 28 Window size change 4 3 BSD Sun SIGIO 29 1 0 now possible 4 2 BSD SIGPWR 30 Power failure restart System V Note Signal 20 is used to stop a process and moves it to the background 104 CIS 90 Lesson 11 Job Control A feature of the bash shell aea Ctrl Z or Ctrl F sends SIGTSTP 20 signal e Stops suspends a foreground process aan aeons Ctrl Z is tapped which 1 Stopped stops the sleep command imms opus ps 1 u rsimms ID PID PPID PR N DDR SZ WCHAN TTY TIME CMD PID 7728 1 5368 5365 75 2460 00 00 00 sshd d 5369 5368 76 65 wait pts 0 00 00 00 bash IS stoppe 1 6203 6200 75 2491 00 00 00 sshd 6204 6203 75 1165 pts 6 00 00 00 bash 7730 5369 0 78 0 1062 pts 0 00 00 00 ps rsimms opus 105 bg command Resumes a suspend
9. in the file job1 at 10 30 PM at 11 59pm at cat files out bigshell lab08 at gt cp lab08 home rsimms turnin lab08 9LOGNAME at Ctrl D This will run the commands entered after the at command at 11 59 PM Hold down the Ctrl key then tap the D key on the keyboard for an EOF end of file 68 CIS 90 Lesson 11 4 d i J Load Balancing Managing queued jobs home cis90 roddyduk cat jobl cp bin myscript bin myscript bak echo Job 1 finished myscript has been backed up mail s Job 1 roddyduk at now 5 minutes lt jobl 12 14 at now 2 hours lt jobl 14 09 home cis90 roddyduk job 24 at 2008 11 12 home cis90 roddyduk job 25 at 2008 11 12 home cis90 roddyduk job 26 at 2008 11 12 home cis90 roddyduk job 27 at 2008 11 19 home cis90 roddyduk job 28 at 2011 12 12 home cis90 roddyduk home cis90 roddyduk 25 2008 11 12 28 2008 12 12 27 2008 11 19 26 2008 11 12 24 2008 11 12 14 03 I2 16 12 at teatime lt jobl 16 00 at now 1 week lt jobl 12310 at 3 00 12 12 2011 lt jobi 03 00 jobs atq 09 00 10 00 14 home cis90 roddyduk a a a a a roddyduk roddyduk roddyduk roddyduk roddyduk This job makes a backup of myscript and sends an email when finished Several ways to specify a future time to run Use the atq command to show queued jobs 69 CIS 90 Lesson 11 RI Load Balancing Managing queued jobs home ci
10. the command to finish before you type more commands Example 2 home cis90 simmsben find user 1200 2 duh sort gt huh amp 1 11601 home cis90 simmsben date Tue Nov 9 14 38 35 PST 2010 Hit enter to get the prompt and continue working while the find command runs in the background CIS 90 Lesson 11 Job Control Using amp to run a command in the background i ty QG O 4 After running Firefox in the foreground it s not possible to Ubuntu Start Page enter more commands until Firefox is closed Bn Most Visited v Getting Started Latest Headlines v Ubuntu Start Page Mo Update Manager 56 CIS 90 Lesson 11 Job Control Using amp to run a command in the background LE ON Qcs90 O 4 F dit cis90Qeko efo cis90 eko Ifirefox amp s ps N Ubuntu Start Page Mozilla Firefox PID TTY TIME CMD File Edit View History Bookmarks Tools 1370 pts 0 00 00 00 bash z 1465 pts 0 00 00 00 firefox e A http start ubuntu com 1 1470 pts 0 00 00 00 run moz 1474 pts 0 00 00 01 firefox Most Visitedv e Getting Started Latest Headlines v RE p 999 P aussen After running Firefox in the background it is still possible to enter more commands Update Manager Ubuntu Start Page Mo CMe Peg CIS90 Lessonit MIN Job Control A feature of the bash shell amp Append to a command to run it in the background bg Resumes a suspended job in the backgroun
11. 20669 0 76 0 1054 pts 1 00 00 00 ps s ps 1 grep csh O S 1200 20618 20540 0 75 0 1330 rt_sig pts 1 00 00 00 csh ps l grep csh gt bigshell cat bigshell O S 1200 20618 20540 0 75 0 1330 rt_sig pts 1 00 00 00 csh 13 grep practice How many CIS130 accounts are there e Is the cronjob daemon crond running right now Has the mysql package been installed on Opus qm F s Review of Processes CIS 90 Lesson 11 REL 11 p Program to process home cis90 roddyduk send stdout A process is a program that has been loaded into stdin memory and is either running executing stderr instructions or waiting to run 16 CIS 90 Lesson 11 Program to process lheome cr 90 reoddyduk send Options NA Args NA process is a program that has been loaded into stdin memory and is either running executing stderr instructions or waiting to run 17 CIS 90 Lessons E EB DEF A Process at Work A process reads from stdin writes to stdout puts error messages in stderr and may get interrupted from time to time by a signal A process is a program that has been loaded into memory and is either running executing instructions or waiting to run x Wo Ces CIS 90 Lesson 11 EE 11 ru Example program to process sort command home cis90 roddyduk sort dev pts 0 duke benji stdout SES m benji SEY aah duke homer SIG eue
12. CIS 90 Lesson 11 Lesson Module Status Slides draft Properties done Flash cards First minute quiz done Web calendar summary done Web book pages done Commands done Lab done Supplies na Class PC s na Chocolates Email Tech file for Lab 9 CCC Confer wall paper done Materials uploaded Backup headset charged Backup slides CCC info handouts on flash drive Check that room headset is charged done CIS 90 Lesson 11 Instructor Rich Simms Dial in 888 450 4821 Passcode 761867 LER EP CPE Eric Dan M Basa Marisol Fe Br d mt DEN Apt Sow f f ie i Re 77 3 Pav AM Email me fisimms cabrille edu a relatively current photo of your pea for 3 points extra credit CIS 90 Lesson 11 ER 11 ru Quiz Please close your books notes lesson materials forum and answer these questions in the order shown 1 Name four states a process can be in 2 What command shows the current running processes 3 What is the difference between the fork and exec system calls email answers to risimms cabrillo edu CIS 90 Lesson 11 Has the phone bridge been added IS recording on Does the phone bridge have the mike Share slides putty rsimms simmsben roddyduk and Chrome Disable spelling on PowerPoint CIS 90 Lesson 11 n 11 i vi editor Create and modify text files Quiz Questions from last week grep Review
13. H z t iig 4 HEHH z z z HHHH FEEFEE HEHHE Benji tries using the keyboard to send a SIGI NT 2 using Ctrl C but nothing happens because app is ignoring SIGINT 45 CIS 90 Lesson 11 Signals Benji runs app RRERRR FEFEFE FFFES BEFFFES HHG z HEHE HEHHE t z z z z FFFFFFE FFFFF Benji tries using the keyboard to send a SIGQUIT 3 using Ctrl but app reacts by saying quit it 46 CIS 90 Lesson 11 Signals Benji runs app home cis90 roddyduk PID TTY TIME CMD 6657 00 00 00 sshd 6658 pts i 00 00 00 bash 7033 00 00 00 sshd 7034 pts 2 00 00 00 bash 7065 pts 2 00 00 00 app g pts TUU home ci bash kill 7065 Opera home cis90 roddyduk S ot permitted Benji asks his friend Duke to kill off his stalled app process Duke uses ps to look it up but does not have permission to kill it off CIS 90 Lesson 11 i hi Signals Benji runs app gj simmsben opus BRERR R FERRER FERE ERRER Sera OO n B z B B T z B p i fi E TT 2242 E 8 H B B z fi E B E E ecu ES F B 48882 gages 2 simmsbenQopus home cis90 simmsben S ps u simmsben PID TTY TIME CMD 6657 00 00 00 sshd 6658 pts 1 00 00 00 bash 7033 00 00 00 sshd 7034 pts 2 00 00 00 bash 7065 pts 2 22 Da 00 app pts 00 00 sleep 7844 pts 1 o0 ane 00_ps home cis90 simm
14. MIN 4 39 SIGRTMIN 5 40 SIGRTMIN 6 41 SIGRIMIN 7 42 SIGRIMIN 8 43 SIGRIMIN 9 44 SIGRTMIN 10 45 SIGRTMIN 11 46 SIGRTMIN 12 47 SIGRIMIN 13 48 SIGRIMIN 14 49 SIGRTMIN 15 50 SIGRTMAX 14 51 SIGRTMAX 13 52 SIGRTMAX 12 53 SIGRTMAX 11 54 SIGRTMAX 10 55 SIGRTMAX 9 56 SIGRTMAX 8 57 SIGRIMAX 7 58 SIGRTMAX 6 59 SIGRTMAX 5 60 SIGRTMAX 4 61 SIGRTMAX 3 62 SIGRTMAX 2 63 SIGRTMAX 1 64 SIGRTMAX home cis90 simmsben 34 CIS 90 Lesson 11 Signals SIGHUP 1 Hangup POSIX SIGINT 2 Terminal interrupt ANSI Ctrl C SIGQUIT 3 Terminal quit POSIX Ctrl A SIGILL 4 Illegal instruction ANSI SIGTRAP 5 Trace trap POSIX SIGIOT 6 IOT Trap 4 2 BSD SIGBUS 7 BUS error 4 2 BSD SIGFPE 8 Floating point exception ANSI SIGKILL 9 Kill can t be caught or ignored POSIX SIGUSR1 10 User defined signal 1 POSIX SIGSEGV 11 Invalid memory segment access ANSI SIGUSR2 12 User defined signal 2 POSIX SIGPIPE 13 Write on a pipe with no reader Broken pipe POSIX SIGALRM 14 Alarm clock POSI X SIGTERM 15 Termination ANSI Use kill to see all signals 35 CIS 90 Lesson 11 amp FR H p Signals SIGSTKFLT 16 Stack fault SIGCHLD 17 Child process has stopped or exited changed POSIX SIGCONT 18 Continue executing if stopped POSIX SIGSTOP 19 Stop executing can t be caught or ignored POSIX SIGTSTP 20 Terminal stop signal POSIX Ctrl Z or Ctrl F SIGTTIN 21 Background process trying to read from TTY POSIX SIGTTOU 22 Ba
15. MIN 5 SIGRTMIN 9 SIGRTMIN 13 SIGRTMAX 13 SIGRTMAX 9 SIGRTMAX 5 SIGRTMAX 1 SIGINT SIGABRT SIGUSRI SIGALRM SIGCONT SIGTTOU SIGVTALRM SIGPWR SIGRTMIN 2 SIGRTMIN 6 SIGRTMIN 10 SIGRTMIN 14 SIGRTMAX 12 SIGRTMAX 8 SIGRTMAX 4 SIGRTMAX SIGQUIT SIGBUS SIGSEGV SIGTERM SIGSTOP SIGURG SIGPROF SIGSYS SIGRTMIN 3 SIGRTMIN 7 SIGRTMIN 11 SIGRTMIN 15 SIGRTMAX 11 SIGRIMAX J SIGRTMAX 3 x J i i j A a i 4 SIGILL SIGFPE SIGUSR2 SIGSTKFLT SIGTSTP SIGXCPU SIGWINCH SIGRTMIN SIGRTMIN 4 SIGRTMIN 8 SIGRTMIN 12 SIGRTMAX 14 SIGRTMAX 10 SIGRTMAX 60 SIGRTMAX 2 101 20 Ces CIS 90 Lesson 11 E l ru The mystery of Ctrl Z vs Ctrl F CIS 90 Lesson 11 Signals Special keystrokes stty a Speed 38400 baud rows 26 columns 78 line 0 intr C quit N erase kill U eof D eol lt undef gt eol2 lt undef gt swtch lt undef gt start Q stop S rprnt R werase W lnext V flush O min 1 time 0 rsimms opus stty a speed 38400 baud rows 39 columns 84 line 0 intr C quit N erase kill U eof D eol lt undef gt eol2 lt undef gt swtch lt undef gt start Q stop S rprnt R werase W lnext V flush O min 1 time 0 Why does the keystroke to send a Suspend SIGTSTP or 20 signal differ between roddyduk F or Ctrl F and rsimms Z or Ctrl Z 103 CIS 90 Lessons
16. That hippie talk fer the rat hole CIS 90 Lesson 11 http vim wikia com wiki Main Page li PE i n Code Life ft Googie PELLE OF Buen V Connect t COMEC bed 7 um Te VO Q ff r hup vimwikiacom wki l Man Page happy town beeem m TONIGHT 1019c 99 Welcome to the Vim Tips wiki This wiki is about the editor Vim We aim to exchange tips and tricks with other Vim users Please help by improving or adding comments to Community portal any tip Te do Wf you are new to Vim we have plenty of tips that will help you get Top content gt started folding catagory We are currently editing over 1 592 articles Searching category d About this wiki Create a new article New tips E upicsa a new image Pobcies and how to edit Recent changes Random page Discussions and asking questions Help Special pages Create a new tip amp Vim on Freenode i d Information 1 592 articles on tis wad Featured tip for April view archive Vim documentation Links to guides books J Folding I tutonals and information on other sites 5 hours ago by JohnBeckett We all know what a tab page is each tab holds a different file Vim scripts Recent changes and J Right click in Windows Actually Vim tabs are not like that Instead tab pages in Vim offer descnptions of featured scripts Exploter to open gvim in much more flexib ity and pronde many features that are unavai
17. ckground process trying to write to TTY POSIX SIGURG 23 Urgent condition on socket 4 2 BSD SIGXCPU 24 CPU limit exceeded 4 2 BSD SIGXFSZ 25 File size limit exceeded 4 2 BSD SIGVTALRM 26 Virtual alarm clock 4 2 BSD SIGPROF 27 Profiling alarm clock 4 2 BSD SIGWINCH 28 Window size change 4 3 BSD Sun SIGIO 29 O now possible 4 2 BSD SI GPWR 30 Power failure restart System V Use kill to see all signals 36 The result of sending a signal to a process be ignored e default action die e execute some predefined function This running process gets signal 18 SIGCONT Wo Neg CIS 90 Lesson 12 F iHa Review of kill command usage CIS 90 Lesson 11 Signal 2 s Ctrl C are ignored Jim s app script B vinmopusonelsssolacpot T m TAN A Le in bin sh 5 app script to demostrate use of signals Usage run app with no options or parameters Send signals to it with keystrokes or kill command Notes stty echo stop the display of characters typed stty echo makes typed characters visible again stty susp Z sets suspend keystroke to Ctlr Z to stop forground processes stty susp 8 sets suspend character to to stop foreground processes 11 2 Iqnore SIGINT Handle SIGQUIT stty echo susp Z echo ee echo cleanup exit 15 Handle SIGTERM banner testing stty echo susp CIS 90 Lesson 11 Usage run app with no options or parameters Send signals to it w
18. d fg Brings the most recent background process to the foreground jobs Lists all background jobs Use jobs bg fg to list and resume jobs in the foreground or background 58 CIS 90 Lesson 11 Job Control A feature of the bash shell When a process is running status R the user can stop it status T and choose whether it es runs in the background or j foreground Running in Background 59 CIS 90 Lesson 11 41 ru Job Control A feature of the bash shell Command Command amp 24 X Running in j Foreground N s Ctrl F CIS 90 students A Ctrl Z everyone else Running in Background Stopped Use the jobs command to view 60 stopped and background jobs PHa Job Control Find out with keystroke combination is configured to suspend a process home cis9001 simmsben stty a speed 38400 baud rows 24 columns 80 line 0 intr C quit N erase kill U eof D eol lt undef gt eol2 lt undef gt swtch lt undef gt start Q stop S susp F rprnt R werase W lnext V flush O min 1 time 0 parenb reo esc sur EC SIE DSL Cr e o E er Usictg Sie chis rni nk 4 sie Tit ab qon 1 gt a amick MD Ke SCIE nc 1 P Om es dear r4 mec Om nx ef fe savoie e DN ester uolo x la e ss Lute iS Op esis olcuc ocEn lIMonlcre onocr onde os MS ofi c est da ees Qe ato DNS SOL voc 0m tO isig icanon iexten echo echo
19. dd your gen custom words How to add words to your dictionary ANA Testing vins PAN personal Scenery a Nase rn emm angel Wf your language in Engish create a fie in your hone Grectery cated spelen per personal 1 em less CERTES name If VO your language i is English create a file in your home directory Trackback URL for this po wwe Called aspell en pws fat acey oe Dore personal ws 1 1 en 0 Samat quasirhombicosidodecahedron Googling linux aspell personal dictionary yields this page Bingo Thank you Samat Jain 91 CIS 90 Lesson 11 41 ru spell command home cis90 roddyduk edits ed home cis90 roddyduk echo personal ws 1 1 en 0 gt aspell en pws home cis90 roddyduk echo CIS aspell en pws home cis90 roddyduk cd edits home cis90 roddyduk edits spell text home cis90 roddyduk edits This is how you would add your own custom dictionary to be used with spell checks 92 CIS 90 Lesson 11 CIS 90 Lesson 11 New commands vi Run vi editor New Files and Directories na na 94 CIS 90 Lesson 11 FR 11 ru Next Class Assignment Check Calendar Page on web amp i SS site to see what is due next week eo esq Quiz questions for next class we e How do you send a SIGKILL to one of your own processes e What vi command is used to exit vi without saving any of the changes you made e What v
20. e cis90 roddyduk jobs 1 Done C PR NI ADDR SZ 0 76 0 1165 0 78 0 927 0 78 0 1051 sleep 60 WCHAN wait finish WCHAN wait 322800 TTY pts 0 pts 0 pts 0 TTY pts 0 pts 0 pts 0 00 00 00 00 00 00 IME 00 00 00 00 00 00 IME 00 00 00 00 00 00 CMD bash sleep ps CMD bash sleep ps Instead of using bg to resume a stopped process in the backgroud lets use a kill signal instead 99 CIS 90 Lesson 11 amp FR H p SIGSTKFLT SIGCHLD SIGCONT SIGSTOP SIGTSTP SIGTTIN SIGTTOU SIGURG SIGXCPU SIGXFSZ SIGVTALRM SIGPROF SIGWINCH SIGIO SIGPWR Signals Stack fault Child process has stopped or exited changed POSIX Continue executing if stopped POSIX Stop executing can t be caught or ignored POSIX Terminal stop signal POSIX Ctrl Z or Ctrl F Background process trying to read from TTY POSIX Background process trying to write to TTY POSIX Urgent condition on socket 4 2 BSD CPU limit exceeded 4 2 BSD File size limit exceeded 4 2 BSD Virtual alarm clock 4 2 BSD Profiling alarm clock 4 2 BSD Window size change 4 3 BSD Sun I O now possible 4 2 BSD Power failure restart System V Use kill I to see all signals CIS 90 Lesson 11 Signals Use kill 1 to see all of them home cis90 roddyduk kill I L SIGHUP SIGTRAP SIGKILL SIGPIPE SIGCHLD SIGTTIN SIGXESZ SIGIO SIGRTMIN 1 SIGRT
21. e display of characters typed stty echo makes typed characters visible again stty susp Z sets suspend keystroke to Ctlr Z to stop forground processes stty susp 8 sets suspend character to to stop foreground processes z trap 2 Ignore SIGINT trap echo n quit it 3 Handle SIGQUIT e de ode de ce che ce oc e che eo stty echo susp Z echo ee echo cleanup exit 15 Handle SIGTERM Endless loop CIS 90 Lesson 11 Jim s app script IEP imsopusomeiosordegor T TAN l E ited bin sh 5 app script to demostrate use of signals Usage run app with no options or parameters Send signals to it with keystrokes or kill command Notes stty echo stop the display of characters typed stty echo makes typed characters visible again stty susp Z sets suspend keystroke to Ctlr Z to stop forground processes stty susp 8 sets suspend character to to stop foreground processes z trap 2 Ignore SIGINT trap echo n quit it 3 Handle SIGQUIT stty echo susp Z echo ee echo cleanup exit 15 Handle SIGTERM banner testing stty echo susp 8 CIS 90 Lesson 11 Signals Benji runs app a simmsben opus PRERER R FERREE FERFE PEEEEERO Seret B gt LIII LIII I z FEEFEE HEHHE Benji logs in and runs app uh oh its stuck 44 CIS 90 Lesson 11 Signals Benji runs app a simmsben opus 88RER SSSSFES PEFFE FFFFFSE HHH
22. e echok echonl noflsh xcase tostop echoprt eclesia eitke home cis9001 simmsben In this case it is Ctrl F that will be used to suspend a process How is yours configured CIS 90 Lesson 11 Job Control Managing jobs home cis9001 simmsben sleep 120 Ctrl Z or Ctrl F to suspend process 1 Stopped Sleep home cis9001 simmsben sleep 110 Ctrl Z or Ctrl F to suspend process 2 Stopped Sleep home cis9001 simmsben sleep 100 Ctrl Z or Ctrl F to suspend process 3 Stopped sleep home cis9001 simmsben jobs 1 Stopped sleep 2 Stopped Sleep 3 Stopped sleep 120 110 100 120 110 100 Lets start up 3 sleep commands and suspend each of them Note The sleep command is a simple Way to run a command that will take awhile to finish sleep 120 will last 120 seconds before it IS finished 62 CIS 90 Lesson 11 Job Control Managing jobs home cis900o1 simmsben jobs 1 Stopped sleep 120 2 Stopped Sleep 110 3 Stopped sleep 100 home cis90ol simmsben ps 1 F S UID PID PPID C PRI NI ADDR SZ WCHAN TTY TIME CMD 0 S 1082 5364 5363 0 75 O 1168 wait pts 2 00 00 00 bash 0 1082 5452 5364 0 75 0 929 finish pts 2 00 00 00 sleep 0 1082 5453 5364 0 75 0 929 finish pts 2 00 00 00 sleep 0 1082 5454 5364 0 75 0 929 finish pts 2 00 00 00 sleep O R 1082 5459 5364 0 77 0 1054 pts 2 00 00 00 ps Note all three processes are sTopped 63
23. ed job in the background 1 Stopped rsimms opus bg 1 sleep 5 amp rsimms opus rsimms opus sleep 5 CIS 90 Lesson 11 Job Control A feature of the bash shell rsimms opus ps 1 UI PID 7728 dn is gone 201 F 5 0 5 0 0 201 201 rsimms opus S S S S 201 S S R D PID 5368 5369 6203 6204 7742 PPID 5365 5368 6200 6203 5369 C 0 0 0 0 0 u rsimms PR N 75 76 75 75 78 D DR SZ WCHAN 2460 165 wait 2491 1165 1061 TEY 5 pts 0 a pts 6 pts 0 E 4 j 4 1 J bg resumes the sleep command 106 CIS 90 Lesson 11 Signals Jim s app script WB simmsQopusnome cso depot SIEUT Tm m m es imn app script to demostrate use of signals Usage run app with no options or parameters Send signals to it with keystrokes or kill command Notes stty echo stop the display of characters typed stty echo makes typed characters visible again stty susp Z sets suspend keystroke to Ctlr Z to stop forground processes susp sets suspend character to 8 to stop foreground processes 2 ignore SIGINT echo n quit it 3 Handle SIGQUIT stty echo susp Z2 echo ee echo cleanup exit 15 Handle SIGTERM banner testing stty echo susp amp one N this is why Cntl F suspend stopped working and we had to use Ctrl Z
24. home cis90 roddyduk A command like sort is a program when it is stored on the drive It is a process when it is duke stdin copied to memory by benji the kernel and either stderr star running or waiting to homer run xi CIS 90 Lesson 11 example program to process ls 1 bin p gws gt dev null Note Is gets its input from the command line and the OS kernel and writes to stdout redirected to dev null and stderr Em stdin directory contents are read using the kernel stderr 20 CIS 90 Lesson 11 Process Lifecycle PID 582 PID 582 PPID 501 PID 501 PID 501 PPID 250 PPID 250 PPID 250 21 CIS 90 Lesson 11 22 11 ru Process Lifecycle PID 582 Child process different PI D PPID 501 PID 501 PID 501 Parent process PPID 250 PPID 250 1 When a program is loaded into memory a new process must be created This is done by the parent process bash making a copy of itself using the fork system call The new child process is a duplicate of the parent but it has a different PI D 22 CIS 90 Lesson 11 LE 11 ru Process Lifecycle PID 582 PID 582 PPID 501 PID 501 PID 501 PPID 250 PPID 250 2 An exec system call is issued to overlay the child process with the instructions of the requested command The ne
25. i commands are used for copy and paste 95 CIS 90 Lesson 11 CIS 90 Lesson 11 home cis90 roddyduk bash roddyduk opus bash roddyduk opus bash roddyduk opus ps PID TTY TIME CMD H 11198 pts 6 00 00 00 bash Parent and child 11233 pts 6 00 00 00 bash 11257 pts 6 00 00 00 bash 11284 pts 6 00 00 00 bash 11309 pts 6 00 00 00 ps roddyduk opus 1 ps 1 FS UID PID PPID C PR NI ADDR SZ WCHAN TTY TIME CMD O S 1000 11198 11197 0 75 D 1165 wait pts 6 00 00 00 bash O S 1000 11233 11198 0 75 0 1166 wait pts 6 00 00 00 bash O S 1000 11257 11233 0 75 D 1166 wait pts 6 00 00 00 bash 0 S 1000 11284 11257 0 75 0 1165 wait pts 6 00 00 00 bash O R 1000 11312 11284 0 77 D 1051 pts 6 00 00 00 ps roddyduk opus exit exit roddyduk opus exit exit roddyduk opus exit exit home cis90 roddyduk ps 1 FS UID PID PPID C PR NI ADDR SZ WCHAN TTY TIME CMD O S 1000 11198 11197 0 75 0 1165 wait pts 6 00 00 00 bash O R 1000 11263 11198 0 77 0 LOS ES pts 6 00 00 00 ps home cis90 roddyduk 97 PAD DRPD O0 t 0 roddyduk opus sleep 60 1 Stopped sleep 60 roddyduk opus sleep 90 2 Stopped sleep 90 r
26. inning of line REPLACE undo lant chang fod tat fare and ca bak ward rege ss Lasts Range And sext line the warts AROUND dh tot wt move to lime search bakward f L amp 4 dr rigis ap down show heiter right s taat from current ORA F bat f in ICm U D ap dom CIS 90 Lesson 11 bin mail and vi home cis90 simmsben mail roddyduk Subject Good bones Hey Duke I really appreciate thatbone you sent me last week Let me knwo if you want to go mark some fench posts this weekend n Later Ben You are composing a message and you spot some typos CRUD what can you do 82 CIS 90 Lesson 11 bin mail and vi home cis90 simmsben mail roddyduk Subject Good bones Hey Duke I really appreciate thatbone you sent me last week Let me knwo if you want to go mark some fench posts this weekend und Later Ben Well you could try the v command 83 CIS 90 Lesson 11 I really appreciate thatbone you sent me last week Let me knwo if you want to go mark some fench posts this weekend te tmp ReqY2d2b 6L 141C EL ss The message is loaded into vi where changes or additions can be made wq is used to save and quit vi 84 CIS 90 Lesson 11 RE ail bin mail and vi home cis90 simmsben mail roddyduk Subject Good bones Hey Duke I really appreciate thatbone you sent me last week Let me knwo if you want to go mar
27. ith keystrokes or kill command Notes stty echo stop the display of characters typed stty echo makes typed characters visible again stty susp Z sets suspend keystroke to Ctlr Z to stop forground processes stty susp 8 sets suspend character to to stop foreground processes Signal 3 s i i Cntrl print quit it echo cleanup exit 15 Handle SIGTERM message banner testing stty echo susp CIS 90 Lesson 11 Signal 15 s close gracefully Jim s app script IEP imsopusomeiosordegor T TAN l E ited bin sh 5 app script to demostrate use of signals Usage run app with no options or parameters Send signals to it with keystrokes or kill command Notes stty echo stop the display of characters typed stty echo makes typed characters visible again stty susp Z sets suspend keystroke to Ctlr Z to stop forground processes stty susp 8 sets suspend character to to stop foreground processes 9 Ignore SIGINT echo n quit it 3 Handle SIGQUIT 15 Handle SIGTERM banner testing stty echo susp sleep i one Redefines the keystroke to suspend job and move it to the background CIS 90 Lesson 11 Jim s app script ME rsimms opus home cis90 depot v mr ae M D b i M u 2 app script to demostrate use of signals Usage run app with no options or parameters Send signals to it with keystrokes or kill command Notes stty echo stop th
28. k some fench posts this weekend Later Ben V continue Cas home cis90 simmsben The earlier text with typos is still showing however the corrected version is what is actually sent 85 CIS 90 Lesson 11 RI bin mail and vi home cis90 roddyduk mail Mail version 8 1 6 6 93 Type for help var spool mail roddyduk 1 message 1 unread gt U 1 simmsben opus cabril Mon Nov 10 20 25 22 782 Good bones amp 1 Message 1 From simmsben opus cabrillo edu Mon Nov 10 20 25 32 2008 Date Mon 10 Nov 2008 20 25 32 0800 From Benji Simms lt simmsben opus cabrillo edu gt To roddyduk opus cabrillo edu Subject Good bones Hey Duke I really appreciate that bone you sent me last week Let me know if you want to go mark some fence posts this weekend Later Ben The message Duke reads has all the typos fixed qm F s A Tangent on Spell CIS 90 Lesson 11 Siena spell command home cis90 roddyduk edits cat text Welcome to the CIS 90 class home cis90 roddyduk edits spell text CIS spell command flags CIS as misspelled word How can we add CIS to the dictionary 88 CIS 90 Lesson 11 22 11 ru spell command home cis90 roddyduk edits cat text Welcome to the CIS 90 class How can We add CIS home cis90 roddyduk edits spell text to the dictionary CIS home cis90 roddyduk edits man spell Hmmm No man page No manual entry for spell for spell
29. lable Vim news News from this wiki and wm org explorer mode with standard editors How to report spam fi hours aan fy loheRecken s a anda lias aud fies eds Tips and tricks for VIM users 80 CIS 90 Lesson 11 The Mug of vi T The Mug of Vi Mozilla Firefox n p EE gr E Tec x p Ele Edit View Higtory Bookmarks Tools Help G C X mtp nostachcom mughtm uou Diable S Cookies J CSS TI Forms S Images J Information 9 Miscellaneous 5 Outlines Resize J Tools te View Source Options KOO Cabrillo College Home Page x y 0 unread Yahoo Mail richsimms x The Mug of Vi x gt Sams Publishing Contact Us x O NO STARCH PRESS the finest in geek entertainment The Mug of Vi 12 ounces heavy duty 7 Coo dem 12 95 G Og tap tons mh SES a n E pe pepe tue bonet le tp Ordern e c AN meom e owe P I S Cuir G Coct JOs T Forme Tya D iterator ee y Odi 4 inor D Toute Go Ve toute Opto Koo Hydratio Cotto Codage Home Poga o I D omms Tahoe biel cbe 5 Bu Mog Latai bomn Petang Creet Us ChCk on the image to return to Mus af Vi man page PILE COMMANDS DELETING INSERTING Jeheto weer b ehe EI delete charmar forward bkan repkace sext wah blank line pute text after Lelore cursor insert now bene bobo sbarre insert teat ators telor carsat e na cmd ated mer cost per insert text end beg
30. oddyduk opus ps 1f S UID PID PPID C PR NI ADDR SZ S roddyduk 11529 11528 0 75 0 1165 S roddyduk 11560 11529 0 75 0 X65 S roddyduk 11584 11560 0 75 0 1166 S roddyduk 11608 11584 0 75 0 1166 T roddyduk 11796 11608 0 75 0 926 0 T roddyduk 11798 11608 0 75 0 926 0 R roddyduk 11803 11608 0 77 0 1062 roddyduk opus jobs 1 Stopped sleep 60 2 Stopped sleep 90 roddyduk opus bg 2 sleep 90 amp roddyduk opus jobs 1 Stopped sleep 60 2 Running sleep 90 amp roddyduk opus kill 18 11796 roddyduk opus jobs 1 Done sleep 60 2 Running sleep 90 amp Lesson 11 Resume stopped jobs with bg and kill 18 WCHAN STIME TTY TIME CMD wait 09 36 pts 6 00 00 00 bash wait 09 36 pts 6 00 00 00 bash wait 09 36 pts 6 00 00 00 bash wait 09 36 pts 6 00 00 00 bash finish 09 49 pts 6 00 00 00 sleep finish 09 49 pts 6 00 00 00 sleep 09 49 pts 6 00 00 00 ps 1f 98 CIS 90 Lesson 11 home cis90 roddyduk sleep 60 Ctrl F typed here 1 Stopped sleep 60 home cis90 roddyduk ps l FS UID PID PPID C PR NI ADDR SZ O S 1000 10705 10704 0 75 D 1165 O T 1000 10737 10705 0 84 0 e 927 O R 1000 10739 10705 0 77 0 TOs home cis90 roddyduk kill 18 10737 home cis90 roddyduk ps l FS UID PID 0 S 1000 10705 0 S 1000 10737 PPID 10704 10705 0 R 1000 10741 10705 hom
31. on processes vi Wrap up hands on exercise for topic 5 qm F s Housekeeping 40 Coes CIS 90 Lesson 11 LEE 11 ru Previous material and assignment Questions Lab 8 due at midnight at 11 59pm at cat files out bigshell gt labO8 at cp lab08 home rsimms turnin lab08 LOGNAME at Ctrl D Don t wait till midnight tonight to see if this worked Test with an earlier time Note Lab 9 and five posts due next week CIS 90 Lesson 11 grep CIS 90 Lesson 11 E 11 ru grep usage What is my account information in etc passwd home cis90 simmsben grep LOGNAME etc passwd simmsben x 1200 90 Benji Simms home cis90 simmsben bin bash or home cis90 simmsben grep simmsben etc passwd simmsben x 1200 90 Benji Simms home cis90 simmsben bin bash or home cis90simmsben cat etc passwd grep LOGNAME simmsben x 1200 90 Benji Simms home cis90 simmsben bin bash My user account is simmsben my password is kept in etc shadow my user ID is 1200 my primary group ID is 90 my full name is Benji Simms my home directory is home cis90 simmben my shell is bin bash CIS 90 Lesson 11 RI grep usage Is the CUPS daemon print service running right now home cis90 simmsben ps ef grep cups root 3365 1 0 Sep28 00 00 00 cupsd simmsben 20598 20540 0 08 19 pts 1 00 00 00 grep cups root 31822 1 0 Nov02 00 00 00 eggcups sm client id default4 Yes it i
32. ou miss church on Sunday and someone sends youa get well card Someone asks you how you feel and then listens to what you say Thank God for small towns and the people who live in them In Lab 9 you clean up this text file FE D a vi activity Technology for Mountain Folk 0 I HOU i amp NH LOG ON LOG OFF MONITOR DOWNLOAD MEGA HERTZ FLOPPY DISC RAM HARD DRIVE PROMPT WINDOWS SCREEN BYTE CHIP MICRO CHIP MODEM DOT MATRIX LAP TOP KEYBOARD SOFTWARE MOUSE MAINFRAME PORT ENTER Makin a wood stove hotter Don t add no more wood Keepin an eye on the wood stove Gettin the farwood off the truk When yer not kerful gettin the farwood Whatcha git from tryin to carry too much farwood That thar thing whut splits the farwood Gettin home in the winter time In Lab Q you Whut the mail ain t in the winter time Whut to shut when it s cold outside clean Up Whut to shut when it s blak fly season Whut them dang flys do and Sort this Munchies fer the TV text file Whut s in the bottom of the munchie bag Whut cha did to the hay fields Old Dan Matrix s wife Whar the kitty sleeps Whar ya hang the dang keys Them dang plastic forks and knifs Whut eats the grain in the barn Holds up the barn roof Fancy Flatlander wine Northerner talk few C mon in y all RANDOM ACCESS MEMORY Wen ya cain t member whut ya paid fer the rifle MOUSE PAD when yore wife asks
33. rocess which runs till it is finished 111 Cabs Coes CIS 90 Lesson 11 E 11 ru Instead of using bg to resume a stopped process in the background lets try a SIGCONT signal 18 instead home cis90 roddyduk sleep 60 Ctrl F or Ctrl Z typed here 1 Stopped sleep 60 home cis90 roddyduk ps l FS UID PID PPID C PR NI ADDR SZ WCHAN TTY TIME CMD O S 1000 10705 10704 0 76 0 1165 wait pts 0 00 00 00 bash oBll 1000 10743 10705 0 75 0 926 finish pts 0 00 00 00 sleep OR 1000 10744 10705 0 78 D 1051 pts 0 00 00 00 ps home cis90 roddyduk jobs 1 Stopped sleep 60 home cis90 roddyduk kill 18 10743 home cis90 roddyduk jobs 1 Running sleep 60 amp home cis90 roddyduk ps l FS UID PID PPID ER NI ADDR SZ WCHAN TTY TIME CMD O S 1000 10705 10704 0 75 0 1165 wait pts 0 00 00 00 bash om 1000 10743 10705 0 85 0 926 322800 pts 0 00 00 00 sleep OR 100010746 10705 0 77 0 1050 pts 0 00 00 00 ps home cis90 roddyduk jobs 1 Running sleep 60 amp home cis90 roddyduk jobs 1 Running sleep 60 amp home cis90 roddyduk jobs 1 Done sleep 60 Note sending a 18 signal or using the bg command will 112 resume a stopped process CIS 90 Lesson 11 Signals Run and suspend two jobs sleep 60 Ctrl F or Ctrl Z sleep 90 Ctrl F or Ctrl Z Use jobs to see them
34. rogram that has been loaded into memory and is either running executing instructions or waiting to run 31 CIS 90 Lesson 11 z 4 11 ru Signals T Signals are asynchronous messages sent to processes They can result in one of three courses of action 1 be ignored 2 default action die 3 execute some predefined function How are signals sent 32 CIS 90 Lesson 11 RA FR 1 ru Signals T Signals are asynchronous messages sent to processes They can result in one of three courses of action 1 be ignored 2 default action die 3 execute some predefined function Signals are sent Using the kill command kill PID e Where is the signal number and PID is the process id e if no number is specified SIGTERM 15 is sent REGIE Using special keystrokes Hie EH limited to just a few signals limited to when you have control of the keyboard Use kill to see all signals CIS 90 Lesson 11 M 11 ru Signals Use kill I to see all of them home cis90 simmsben kill 1 1 SIGHUP 2 SIGINT 3 SIGQUIT 4 SIGILL 5 SIGTRAP 6 SIGABRT 7 SIGBUS 8 SIGFPE 9 SIGKILL 10 SIGUSRI 11 SIGSEGV 12 SIGUSR2 13 SIGPIPE 14 SIGALRM 15 SIGTERM 16 SIGSTKFLT 173 SIGCHLD 18 SIGCONT 19 SIGSTOP 20 SIGTSTP 21 SIGTTIN 22 SIGTTOU 23 SIGURG 24 SIGXCPU 25 SIGXFSZ 26 SIGVTALRM 27 SIGPROF 28 SIGWINCH 29 SIGIO 30 SIGPWR 31 SIGSYS 34 SIGRTMIN 35 SIGRTMIN I 36 SIGRTMIN 2 37 SIGRTMIN 3 38 SIGRT
35. rsor to the beginning of the line moves the cursor to the end of the line G moves the cursor to the last line in the file 1G moves the cursor to the first line in the file 105G moves the cursor to line 105 d scrolls down 10 lines u scrolls up 10 lines f page forward one page b page back one page Try typing a number in front of these commands and notice what happens n CIS 90 Lesson 11 un E 11 ru Vi Reading and Writing out files Note to execute any of the following commands from vi you must be in command mode Press the Esc key to enter command mode q exits vi if you have saved your changes q exits vi even if you have not saved your changes W saves any changes you ve made to the file you are editing w filename saves your file to a new name like Save As w filename saves your file to a new name overwriting any previous data r filename reads in the contents of filename starting from the cursor position e filename replaces the current content with the content from filename 74 CIS 90 Lessons E EB BET 0 vi Entering Input mode i Ready to insert characters immediately before the current cursor position a Ready to append characters immediately after the current cursor position I Ready to insert characters at the start of the current line A Ready to append characters at the end of the current line o Ready to input characters in a new line that opens up below the cursor O Ready to input charac
36. s with 3365 10 CIS 90 Lesson 11 grep usage Is Samba File and Print services installed home cis90 roddyduk rpm qa grep samba system config samba 1 2 39 1 e615 samba client 3 0 28 1 e15 2 1 samba 3 0 28 1 e15 2 1 samba common 3 0 28 1 e15 2 1 home cis90 roddyduk Yes the client server and common packages have been installed already CIS 90 Lesson 11 grep usage How many CIS 90 user accounts are there home cis9001 simmsben grep cis90 etc passwd wc I 56 home cis9001 simmsben grep cis90 etc passwd wc I 31 home cis9001 simmsben grep cis900l etc passwd wc I 25 There are 56 31 for the regular section and another 25 for the online section A CIS 90 Lesson 11 m n grep usage Which shell is the biggest Lab 8 home cis90 simmsben Is bin sh bin bash bin csh bin jsh bin ksh bin rbash bin sh bin tcsh home cis90 simmsben csh simmsben opus bash simmsben opus sh sh 3 2 jsh Enter Command ksh ps I F S UID PID PPID C PRI NI ADDR SZ WCHAN TTY TIME CMD O S 1200 20540 20539 0 75 O 1168 wait pts 1 00 00 00 bash O S 1200 20618 20540 0 75 0 1330 rt Sig pts 1 00 00 00 csh O S 1200 20639 20618 0 75 0 1169 wait pts 1 00 00 00 bash O S 1200 20663 20639 0 75 0 1167 wait pts 1 00 00 00 sh O S 1200 20666 20663 0 75 0 380 wait pts 1 00 00 00 jsh O S 1200 20669 20666 0 76 O 1236 wait pts 1 00 00 00 ksh O R 1200 20673
37. s the case of the current character s string1 string2 g replaces all string1 with string2 in the file TI vi activity HOW SMALL IS SMALL YOU KNOW WHEN YOU RE IN A SMALL TOWN WHEN The airporttttt runaway is terraced The polka is more popular ththanan a mashpit on on Saturday noght Third Street is on the edge of town Every sport is played on dirt The editor and publisher of the newspaper carries a camera at all times You don t use your turn signal because everyone knows where you are going knows where you are going YOU KNOW YOU RE IN A SMALL TOWN WHEN You are born on June 13 and your family receives gifts from the local merchants because you are the first baby of the year You speak to each dogg you pass by name and he wags at you You dial a wrong number and talk for 15 minutes anyway You are run off Main Street by a combine Reprinter from the Ayshire Empire News XXXXX You cna t walk for exercise because every car that passes you offers you a ride You get married and the local paper devotes a quarter page to the story You drive into a ditch 5 miles out of town and the word gets back to town before you do YOU KNOW YOU RE IN A SMALL TOWN WHEN YOU KNOW YOU RE IN A SMALL TOWN WHEN YOU KNOW YOU RE IN A SMALL TOWN WHEN The biggest busssssiness on town sells farm machinery You write a check on the wrng bank and it covers you anyway The pickups on Main Street outnumber the cars three to one Y
38. s90 roddyduk jobs The jobs command lists processes home cis90 roddyduk atq running or suspended in the background 25 2008 11 12 14 09 a roddyduk ag COUPLES LEZ 02 94 a roddyduk The xta command lists jobs queued to 27 2008 11 19 12 10 a roddyduk vun in the future 26 2008 11 12 16 00 a roddyduk 24 2008 11 12 12 14 a roddyduk home cis90 roddyduk atrm 24 home cis90 roddyduk atq 25 2008 11 12 14 09 a roddyduk 28 2008 12 12 03 00 a roddyduk odiis iudice IS 27 2008 11 19 12 10 a roddyduk US Q to remove Jobs 26 2008 11 12 16 00 a roddyduk from the queue home cis90 roddyduk 70 CIS 90 Lesson 11 PtH VI Making a script In your bin directory create a file called color and add the following lines echo read echo read echo n What is your name NAME n What is your favorite color COLOR Hi SNAME your favorite color is COLOR Save the file and give it execute permissions with chmod x color Now run your script by typing its name CIS 90 Lesson 11 S TER mm vi Moving around in a file Note to execute any of the following commands from vi you must be in command mode Press the Esc key to enter command mode h moves the cursor one character to the left j moves the cursor down one line k moves the cursor up one line I moves the cursor one character to the right w moves the cursor one word forward b moves the cursor one word back O zero moves the cu
39. sben S kill 2 7065 home cis90 simmsben S Benji logs into another Putty session and sends a SIGINT 2 using the kill command but 48 nothing happens CIS 90 Lesson 11 Signals Benji runs app simmsben opus EXICI X KEREN FFFSFSE FEFFE FERREE HERE F FF FFF 5 5 E z z 5 z z HEHHE HEHHE 5 b 3329 digi quit itiquit itiquit iti All home cis90 simmsben S kill 3 7065 home cis90 simmsben S w Benji ups the ante and sends several SIGQUIT 3s but the app process shrugs them off with two quit it messages p CIS 90 Lesson 11 di Signals Benji runs app FERREE FFFFSFS SERA SERA PEERS z z z HEHE EHHH z z z z 998 FFFFF b e o de ode one quit it quit it quit it ee cleanup home cis90 simmsben S ri i i home cis90 simmsben S kill 15 7065 J home cis90 simmsben S PP Benji decides to send a SIGTERM this time and the app Ww process finishes cleans up and exits CIS 90 Lesson 11 Signals Benji runs app FRS Serui SARA SARA FFFFF F z E Li E EH z HEHHE HH E 5 t t simmsben opus in g Dome cis90 simmsben ps u simmsben PID TTY CMD 6657 00 sshd 6658 pts 1 00 bash 7033 00 sshd 7034 pts 2 00 bash 8237 pts 2 00 app 8279 pts 2
40. ters in a new line that opens up above the Cursor r Ready to replace the current character with the character you type next R Ready to Replace overwrite characters starting at the current cursor position s Ready to replace the current character with the string you type next cw Ready to replace the current word with the string you type next 75 CIS 90 Lesson 11 ER 11 ru Vi Cut Copy Pasting Commands Note to execute any of the following commands from vi you must be in command mode Press the Esc key to enter command mode x Deletes the current character dw Deletes the current word dd Deletes the current line D Deletes to the end of the line yy Copies a line to the clipboard buffer p Pastes whatever is in the clipboard buffer below the current cursor P Pastes whatever is in the clipboard buffer above the current cursor 76 CIS 90 Lesson 11 Da E 11 ru VI Miscellaneous Useful Commands Note to execute any of the following commands from vi you must be in command mode Press the Esc key to enter command mode g Tells you the filename you are editing and what line your cursor is on u Undoes the last command you executed r Undo the undo redo Repeats the last command you executed string Searches for the string of characters in the file n Finds the next occurrence of the current search string looking down the file N Finds the next occurrence of the current search string looking up the file Change
41. w instructions then are executed The parent process issues the wait system call and goes to sleep 23 CIS 90 Lesson 11 Process Lifecycle PID 582 PID 582 PPID 501 j Pd PID 501 PID 501 o PPID 250 PPID 250 PPID 250 3 When the child process finishes executing the instructions it issues the exit system call At this point it gives up all its resources becomes a zombie The parent is woken up and once the parent has informed the kernel it has finished working with the child the child process is killed and removed from the process table 24 CIS 90 Lesson 11 Process Lifecycle PID 582 PID 582 j PPID 501 Pd PID 501 PID 501 x oU PPID 250 PPID 250 PPID 250 3 If the parent process were to die before the child the zombie will become an orphan Fortunately the init process will adopt any orphaned zombies 25 CIS 90 Lesson 11 Process Information Use 1 for additional options rsimms opus pS l FS UID PID PPID C PRI NI ADDR SZ WCHAN TTY TIME CMD O S 201 6204 6203 0 75 0 1165 wait pts 6 00 00 00 bash OR 201 6521 6204 0 77 0 1050 pts 6 00 00 00 ps pu V ue ds ae Size in 1K blocks User ID Running or sleeping 26 CIS 90 Lesson 11 S LR H ru Process Lifecycle PID 6521 PID 6521 Running the
42. xits vi if you have saved your changes q exits vi even if you have not saved your changes W saves any changes you ve made to the file you are editing w filename saves your file to a new name like Save As w filename saves your file to a new name overwriting any previous data r filename reads in the contents of filename starting from the cursor position e filename replaces the current content with the content from filename 116 CIS 90 Lesson 32 E EB BE 0 vi Now practice these commands i Ready to insert characters immediately before the current cursor position a Ready to append characters immediately after the current cursor position I Ready to insert characters at the start of the current line A Ready to append characters at the end of the current line o Ready to input characters in a new line that opens up below the cursor O Ready to input characters in a new line that opens up above the Cursor r Ready to replace the current character with the character you type next R Ready to Replace overwrite characters starting at the curent cursor position s Ready to replace the current character with the string you type next cw Ready to replace the current word with the string you type next 117 CIS 90 Lesson 11 ER 11 ru vi Now practice these commands Note to execute any of the following commands from vi you must be in command mode Press the Esc key to enter command mode x Deletes the current character
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