This lab assignment will give you practice with unix, using a text
editor (emacs), and running update21 and handin21.
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 topics, lab assignments,
weekly readings, and announcements will be posted to the class Schedule
Read through our
web pages and try the various unix commands. Make sure you
understand the following commands: ls, cd, pwd, passwd, less, cat, mv, rm, cp, ssh
Learn the text editor we will use to write programs by running the emacs tutorial.
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 text editor, run update21 (if you haven't already) to get the starting directory for lab 0, then move into that directory (enter the blue commands):
$ update21 # creates subdirectory 00 in your cs21/labs directory $ cd # cd to home directory (in case you are not there already!) $ 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, it will print /home/your_uname/cs21/labs/00The lab submission program, handin21, will grab all files from your cs21/labs/00 directory. Each week, make sure you create your lab programs and files in the correct cs21/labs/XX directory!
Next, edit the file named
bio.txt (using emacs bio.txt &)
and answer the questions in that file.
$ emacs bio.txt &
After you are done editing your bio.txt file, save your changes, exit the editor, then enter the ls command to list out all files. You should see the bio.txt file. You can also run the cat command on the file to see it's contents in the terminal window:
$ ls bio.txt $ cat bio.txt ... ... contents of bio.txt file displayed here ...
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. Each time you
run it new versions of your files will be submitted. Running handin21
after you finish a program, after any major changes are made, and
at the end of the day (before you log out) is a good habit to get into.
Write a program called name.py that asks the user for their name and says "Hello", like this (what the user types is in blue):
$ python name.py Name: Jeffrey Hello, Jeffrey !
Once you get your program running, turn it in by running handin21 again.
When you are done working in the lab, you should log out of the computer you are using. First quit any applications you are running, like firefox and the Terminal. Then click on the logout icon and choose "log out".
If you plan to leave the lab for just a few minutes and then come right
back to work, you do not need to log out, but it is a good idea to xlock
your machine while you are gone. You can xlock by clicking on the xlock icon
by running the xlock command at the shell prompt.
You should not xlock a machine if you
plan to be gone for more than about 10 minutes, and you should not xlock main
lab machines during times when classes are held in the lab.
If you can't find a file you created, check to see that you are in the directory you think you are.
$ mv bio.txt ~/cs21/labs/00/bio.txt