This lab assignment should get you used to running update21
and handin21 and give you some practice with Unix and editing files.
Don't forget to attend a Using UNIX session.
You can attend either of these sessions (they are identical):
Tuesday, Aug. 31, 4-5pm, 240 Science Center
Wednesday, Sept. 1, 8-9pm, 240 Science Center
Start by reading through all of the CS21 homepage. Pay special attention to the
Schedule, Academic Integrity and How to succeed in CS21 parts. You
should get into the habit of checking this page weekly. The class
schedule, lab assignments, weekly readings, and quiz dates
are available here.
Go to the CS department's homepage
From there click on the "cs lab help" button (on the left) and read the
The User Agreement,
and The CS Lab Rules pages.
To begin the assignment, open a Terminal window. You do this by clicking on the black square in the center of the toolbar
When the Terminal window opens, you
will see the shell prompt which will look something like this:
In the above prompt, lemon is the name of the machine you are working on, so this may be different for you if you are working on a different machine.
If you don't have one already, create a cs21 subdirectory in your home directory. Here is an example of the commands to enter to do this and to verify that it worked ('$' is the shell prompt and text after '#' are comments explaining the commands):
$ cd # change current working directory to your home directory $ pwd # print current working directory $ mkdir cs21 # create a new subdirectory named cs21 $ ls # list contents of current working directory (your home directory) $ cd cs21 # change current working directory to cs21 $ pwd # print current working directoryHere is some information about the Unix directory structure.
In your cs21 directory start the editor as follows:
$ xemacsA new window will open with a menu of options across the top. In the far right, select Help, then select Tutorials. The first choice (the default) is in English. Select the language of your choice and begin. Start reading from the top and focus on the sections entitled:
Note: if you added CS21 late, we may not have you in our list of students who can run update21 and handin21. Send me email if you have problems and I'll add you to our list so that these will work for you.
Once you have learned how to use a Unix editor program, run update21 to get the starting directory for the intial lab, then change into that directory:
$ update21 # creates subdirectory 00 in your cs21/labs directory $ cd # cd into your home directory $ cd cs21/labs/00 # cd into the directory for lab 00 $ pwd # check to see that you are in the correct directory # if you are, pwd should list: /home/your_user_name/cs21/labs/00The program handin21 will only submit files in this labs/00 directory.
Next, start up the editor and open a new file named
$ xemacs bio.txtIn the file, answer these questions:
After you are done editing your bio.txt file, save your changes and exit the editor. Run the cat command on the file to catalog it's contents to the terminal window:
$ cat bio.txt
Once you are satisfied with your bio.txt file, hand it in by typing
handin21 at the unix prompt.
You may run handin21 as many times as you like, and only the
most recent submission will be recorded. This is useful if you realize
after handing in some programs that you'd like to make a few more
changes to them.
If you can't find a file you created, check to see that you are in the directory you think you are.
# moves bio.txt from current working directory into my cs21/lab/00 directory $ mv bio.txt ~/cs21/lab/00/bio.txt # this does the same thing, '.' means a file with the same name as the source $ mv bio.txt ~/cs21/lab/00/.