This lab assignment should get you used to running update21
and handin21, and teach you a few of the common commands used in the Linux/UNIX terminal window.
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, homework assignments,
weekly readings, and announcements will be posted to the class Schedule
Much of this assignment will introduce you to some common Linux commands. We will review these commands regularly in class, and you are also encouraged to attend one of the using Linux help sessions this week in Science Center 240. You may attend either session.
To begin the assignment, open a Terminal window. You do
this by clicking on the black square in the center of the
toolbar or by clicking
on the XFCE menu button and then choosing "Terminal". 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 and set the permissions so that only you can access it. Here is an example of 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 to your home directory $ pwd # print current working directory $ mkdir cs21 # create a new subdirectory named cs21 $ ls # list contents of current directory $ chmod 700 cs21 # make cs21 dir only accessible to you $ ls -l # list permissions (cs21 should be drwx------) $ cd cs21 # change to cs21 directory $ pwd # print current working directoryFurther information about the Unix directory structure can be found on the department's web site.
In your cs21 directory run the xemacs tutorial to learn how to edit files in Unix. This tutorial will take about 20-30 minutes.
$ xemacs # start xemacsOnce you have run xemacs, click on Help (top left of the window), then Tutorials, then Default (English).
Once you have learned how to use a Unix editor program, run update21 to get the starting directory for homework 0, then cd 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 xemacs and open a new file named bio.txt and answer these questions:
To start editing the file:
$ xemacs bio.txt
After you are done editing your bio.txt file, save your changes, exit xemacs (C-x C-c), and enter the ls command to list the file bio.txt. You can also run the cat command on the file to list 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.