Unix I

Tom Kelliher, CS 240

Feb. 11, 2004

Administrivia

Announcements

Assignment

SPIM reading from before.

Homework due Feb. 18: 3.2, 3.5 (use only MIPS machine language), 3.6, 3.9, and 3.12.

From Last Time

Immediate instruction format, conditional branches.

Outline

1. Unix.

2. Hands-on Unix lab.

Coming Up

SPIM intro lab.

Unix

• The most important command: logout/ exit.

• The second most important command: man. As in:
  • man man
  • man spim
  • man -k files

• The most important command after logging in for the first time: passwd

Common Trip-Ups and Tips

1. The Delete key doesn't work.
2. There are suspended jobs.
3. The path component separator: /, not \.
4. The arrow keys and other cursor positioning keys.
5. Those ``funny'' keystroke sequences in emacs.
6. Toggling between emacs and the shell.
7. Forgetting your Unix text when you're working.
8. Ctrl-c, Ctrl-z, Ctrl-d, Ctrl-q/Ctrl-s.

Anatomy of a Command

ls -aCF

ls -a -C -F ~kelliher/pub

ls -l ~

cat /usr/var/Enron/offShoreAccounts
less /usr/var/Enron/offShoreAccounts

w | grep ckonradi

gcc -o homework1 homework1.cc library.cc

./homework1 > homework1.results

rm *

rm -i *

alias rm 'rm -i'

less .cshrc .login

script

Unix Concepts

1. Your userid and group.
2. Your home directory.
3. The filesystem; navigation: ., ..
4. Relative, absolute pathnames.
5. Directory commands: cd, mkdir, rmdir, pwd, ls.
6. Filenames; wildcards, abbreviations. File completion.
7. File commands: rm, less, cp, mv.
8. File permissions.
9. The superuser.
10. Processes.
11. Environment and shell variables: PRINTER, PAGER, EDITOR.

    Edit ~/.login and change PRINTER to either hs149 or hs123ps.

12. The shell.
13. Getting help: man, online resources, books.
14. .cshrc, .login, .twmrc, and .xinitrc.

Hands-On Unix Lab

See lab handout.