Guided Tour (Version 3) - Department of Electrical Engineering
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1. or ask a teaching assistant for help Guided Tour v 3 Page 6 CSE 1020 2010F 4 Switch to your newly created directory by entering the command cd csel020 a The command will print nothing if it is successful and you should see a new prompt on the next line i If you see an message then you have either entered the command incorrectly or something went wrong in Step 4 ask a teaching assistant for help 5 You should now be in the directory with the full name cs home cseXXxXxX cse1020 Confirm that you are in the correct directory by entering the pwd command and checking its output 6 Your cse1020 directory is where you should organize all of your CSE1020 work Create a directory to organize all of your lab work by entering the command mkdir lab a Again the command will print nothing if it is successful and you should see a new prompt on the next line 7 Switch to your newly created directory by entering the command cd lab a Again the command will print nothing if it is successful and you should see a new prompt on the next line ask a teaching assistant for help if you see an error message 8 What is the full name of the directory you are now in How can you check that you really are in the directory you think you should be in Go ahead and check 9 Create a directory for the current lab by entering the command mkdir 1 a The directory name is the numeral one not a lower case L 10 Switch to your n2. Guided Tour Version 3 By Steven Castellucci modified by Burton Ma This document was inspired by the Guided Tour written by Professor H Roumani His version of the tour can be accessed at the following URL http www cse yorku ca roumani jbaY ork GuidedTour pdf You will need a CSE account to complete this tour See the Lab Monitor in room CSEB 1006 to get an account Bring your student number and photo identification e g YorkU Card drivers licence etc The Xfce Linux Desktop Workspaces Firefox and Thunderbird Terminal Applications Menu Applications Menu For a list of available applications click the Xfce icon or right click the desktop An application can be started by selecting it from the menu In addition to Firefox and Thunderbird other applications include NEdit a text editor with which to write programs Acrobat Reader to view and print PDF files and OpenOffice to create edit and print Office documents You can also log out by selecting Quit at the bottom of the menu and clicking OK Terminal The terminal also known as the console or the command line allows you to enter commands You will use the terminal to compile run and submit your programs It is the most versatile operating system component that you will use in computer science Starting Firefox and Thunderbird The Firefox Internet browser and the Thunderbird email client can be started with a single click Firefox is configured with
3. an command Example man submit Description Displays the user manual for the passed command The user manual details the type and number of arguments required by the command and lists all the available command options To scroll through the user manual press the spacebar To exit the user manual simply press the Q key Command mkdir dirName Example mkdir eChecks Description Creates a subdirectory with the passed name in the current directory The example creates a subdirectory called eChecks Command cd dirName Example 1 ca Example 2 cd Example 3 cd mail Description Without any argument Example 1 this command changes the working directory to your home directory equivalent to the My Documents folder in Windows With the argument Example 2 this command changes the working directory to the parent directory If you provide the name of a subdirectory as an argument Example 3 this command changes the working directory to be that subdirectory e g the subdirectory called mail Command 1s dirName Example 1 1s Example 2 1s mail Example3 1s txt Description Lists the contents of the directory specified by the argument Without any arguments Example 1 this command lists the visible contents of the working directory If the argument is a directory name Example 2 this command lists the visible contents of that directory e g the subdirectory called mail Example 3 lists all files
4. and password 1 Open a terminal window Make sure that the mouse pointer is inside the terminal window a Inthe terminal window there should be a short piece of text followed by a symbol this is called the prompt 2 Enter the command pwd by typing the command then pressing the ENTER key a The command should print the full name of your home directory something like cs home cseXXXXX where cseXXXXX_ is your CSE account name on the line immediately underneath the command you just entered On the next line you should see a new prompt i If you do not see the output described in 2a then you probably entered the command incorrectly try again or ask a teaching assistant for help 1 Pay careful attention to messages printed by commands you enter the messages usually tell you important information helping you to resolve any problems 3 It is a good idea to keep your directory structure organized so that you can find files easily therefore you should create a directory for all of your CSE1020 work Enter the command mkdir csel020 a The command will print nothing if it is successful and you should see a new prompt on the next line i If you see a message like mkdir cannot create directory cse1020 File exists then you already have a directory named cse1020 and you have probably already taken this course before ii If you see some other message then you probably entered the command incorrectly try again
5. department specific bookmarks while Thunderbird is configured to access your CSE mail account Guided Tour v 3 Page 1 CSE 1020 2010F Workspaces The operating system s desktop is where you can arrange your application windows With Xfce you can arrange you windows across four by default virtual desktops also known as workspaces Although you can only work with one at a time the applications on all workspaces remain running To switch between workspaces you can click on the thumbnail images Alternatively you can scroll the mouse wheel on an empty portion of the desktop Even if you do not use the extra workspaces make sure that you do not accidentally switch to them as you work Focusing with the Mouse With Windows you indicate the active window by clicking within it The window remains active until you minimize it or select another window However with Xfce the active window is the one that contains the mouse pointer If you move your mouse pointer to another window the new window becomes the active one For example if you want to type a command in a terminal you must first position your mouse within its window If as you type your mouse pointer moves outside of the terminal window the terminal will not receive your keystrokes Simple Commands Command pwd Example pwd Description Displays the current directory a k a working directory The same output can be seen a terminal window title bar Command m
6. ewly created directory by entering the command eq 1 11 We will now attempt to complete eCheck Check01A on page 45 of the 3 Edition of the textbook Start the jEdit editor by entering the command jedit CheckOlA java amp a If you do not type the amp symbol jEdit will still start but your terminal will appear to freeze and it will not respond to any new commands that you type What has happened is that you have entered the command to start jEdit and the terminal is waiting until the jEdit command completes i e the terminal will wait until you close jEdit In this case we say that jEdit has been started as a foreground process the terminal will wait until a foreground process completes before it can start another one Guided Tour v 3 Page 7 CSE 1020 2010F If this has happened do not close the terminal Instead move the mouse pointer into the frozen terminal window press and hold the CTRL key and while still holding the CTRL key press the Z key This operation is normally written like CTRL 2Z CTRL 2Z tells the terminal to suspend but not close the command that is currently running You should find that jEdit now appears to be frozen because it has been suspended from running but you now have a prompt in your terminal To resume jEdit and have a terminal that will respond to commands you type enter the command bg The bg command will resume jEdit as a background process A background process can run a
7. in the current directory that have a txt extension You can use the wildcard to search for files that match a pattern There are many options for this command such as a to show hidden files and 1 to show file and directory details Enter the command man ls for further details Guided Tour v 3 Page 2 CSE 1020 2010F Command rm fileOrDir Examplel rm First java Example 2 rm r eChecks Description Removes the file or directory indicated by the argument The first example deletes the file First java The second example note the r option removes directory called eChecks and all of its contents Use this command with caution Command cp orgnl cpy Example cp First java First_backup java Description Copies the file orgnl to the location cpy The example creates a copy of First java called First_backup java Command mv old new Example mv First java Second java Description Moves the file old to the location new This command can also be used to rename files The example renames First java to Second java Command script log Example script Al_log txt Description Records the commands and output generated at the terminal until exit is entered The record is written to a file whose name is passed as an argument Auto Completion and Command History You do not have to type entire filenames or directory paths Type the first couple of characters followed by
8. nd the terminal does not need to wait for it to complete before accepting new commands from the user 12 Move the mouse pointer into the jEdit window and type in the program from the Creating a Java Program section on page 4 of this guide just type in the program instructions for saving compiling and debugging are given below 13 Save your work 14 Move the mouse pointer into the terminal window and compile your program by entering the command javac Check01A java a The command will print nothing if it is successful and you should see a new prompt on the next line i If you get some error messages try to decipher what they mean Note that a compiler error message contains the line number of where the error probably occurred 1 If you think you have identified the error fix it using jEdit save the file and repeat Step 14 otherwise ask a teaching assistant for help 15 Run your program by entering the command java Check01A a Your program should print My name is and you should see a new prompt on the next line 16 Modify your program so that it only outputs My Account Number is cseXXXXX where cseXXXXX_ is your CSE account name Remember to save and re compile everytime you change your program Make sure you get the output shown above 17 Run eCheck to test your program Do so by entering the command java eCheck O1A Guided Tour v 3 Page 8 CSE 1020 2010F in the terminal 18 Read the outpu
9. our code save your changes and recompile your code Enter java First atthe terminal to run your program do not type the java extension Your program should output My name is followed by your name Guided Tour v 3 Page 4 CSE 1020 2010F Configuring eCheck Your weekly lab assignments will take the form of eChecks programs that are checked electronically You will learn more about eChecks in the textbook However you must first configure the eCheck program that checks your code Enter the command java Options ata terminal Va Options version 6A x n Work Offline no marks will be recorded Login ID Password eCheck URL http waww cs yorku ca roumani type ec ec cgi Cancel Apply Uncheck Work Offline Enter your CSE username password and the following URL http www cse yorku ca roumani type ec ec cgi Double check that you entered the URL correctly When you are finished click Apply Submitting eChecks Each eCheck exercise is given a three character code e g 03A You can check an eCheck exercise by entering the following command at a terminal replace 03A with the particular code java eCheck O3A Your eCheck program will be tested with various inputs If your program passes all the tests your code will be automatically submitted and your mark will be recorded If your program does not pass all the tests output will indicate the given input the expec
10. sername and password using the attached keyboard Ensure that the files you want printed are selected and press the print icon in the bottom left corner To exit without printing press the exit icon If you experience any printing problems contact the lab monitor universitet PRINT RELEASE STATION ei PRINT RELEASE STATION UNIVERSITY Y R K Department of Computer Science and Engineering NO R K Department of Computer Science and Engineering f ite UNIVERSITY eee Ci Print Time Size I Files 19 30 34 23759 smbpm 00007795 Xh2i Please Log In To Print Username Password 1 of 1 job is selected for printing Waiting For Identification q e Touch an entry to select or unselect it EXIT Creating a Java Program Before you can run a Java program you need to write its code compile it and correct any syntax errors If you have not yet done so read the above section Creating and Editing Text Files Create a new text file named First java with the following content import java io PrintStream public class First public static void main String args PrintStream output System out output printin My name is Replace with your name Save your program Compile it by entering javac First java ata terminal note the c in javac The compiler will identify the type and location of any syntax errors Correct any errors in y
11. t from eCheck very carefully eCheck emits a lot of information 19 eCheck will indicate an error with your output However it will also tell you what your program produced and what it expects as the correct answer Make the appropriate modification to your code save the change re compile and run your program until you get the output that eCheck expects 20 Repeat steps 17 19 until eCheck states that your program passed all tests 21 Submit your work by entering the command submit 1020 lab01 CheckO1A java a Examine the output from the command carefully you should see the message All files successfully submitted If you do not correct the error and re submit your work You can submit as many times as you want your previous submissions are simply overwritten i Make sure that you are comfortable using the submit command It is the same command that is used during lab tests to submit your programming tests 22 Congratulations you have just finished your first lab Guided Tour v 3 Page 9 CSE 1020 2010F
12. ted output and how your program s output differed from the expected one Examine how your program s output is different make the necessary changes to your program and check the exercise again You can check and revise your program as many times as you want before the eCheck s deadline Nothing is submitted until your program passes all tests Submitting Assignments Not all exercises in computer science courses are eChecks You will be required to submit all non eCheck assignments and lab tests To do so you will use the submit command which has the following structure submit course testName yourFilel yourFile2 yourFileN For example submit 1020 LT1 MyProgram java readme txt It is recommended that you submit your files early and often Newer files overwrite those with the same name For more information enter the command man submit ata terminal Guided Tour v 3 Page 5 CSE 1020 2010F Lab One Your first lab will test your ability to follow written instructions and to apply the information presented in this document This lab assumes that you have configured eCheck as outlined in the above section Configuring eCheck If you have not done so please complete this task before proceeding Before starting read all the instructions and re read this document to address any questions you might have Log in to a workstation in CSEB 1002 CSEB 1004 or CSEB 1006 in whichever room your lab is scheduled using your CSE username
13. the TAB key The operating system will complete the rest of the name or path If there are multiple matches the operating system will complete only the common portion You will have to type additional characters to identify the desired file or directory To repeat a command at a terminal you can use the up and down arrow keys to cycle through commands you previously entered This can be very beneficial during labs and lab tests as you will repeatedly compile and run your program to test it Creating and Editing Text Files To create and edit your programs in 1020 I recommend you use a text editor called jEdit Other text editors are installed on the system such as Pico Emacs and Vim however jEdit is user friendly for new users and it is written in Java To start jEdit you can select it from the applications menu or enter jedit amp at a terminal Optionally you can include a filename e g jedit First java amp If the file already exists it will be opened automatically If not the file will be created Guided Tour v 3 Page 3 CSE 1020 2010F Printing Files Included in your course fee is a print quota of 500 pages To display the number of pages remaining in your quota enter the command pquota ata terminal Typically you can print an open file by selecting Print from the File menu After you send the file to be printed go to any print station in room CSEB 1004 or 1006 Touch the screen to activate it Enter your CSE u
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