Unix, Introduction and Concepts

Tom Kelliher, CS23

Feb. 10, 1997

Unix

• The most important command: logout/ exit

• The second most important command: man. As in:
  • man man
  • man -k g++

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

Common Trip-Ups

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.

Anatomy of a Command

ls -aCF

ls -a -C -F ~kelliher/pub

ls -l ~

cat Class/Cs23/Hw/hw1.tex 

w | grep chapmapj

g++ -o homework1 homework1.cc library.cc

./homework1 > homework1.results

rm *

rm -i *

alias rm 'rm -i'

less .cshrc .login

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.
7. File commands: rm, less, cp, mv.
8. File permissions.
9. The superuser.
10. Processes.
11. Environment and shell variables: PRINTER, PAGER, EDITOR.
12. The shell.
13. Getting help: man, your Unix book.
14. .cshrc, .login, .twmrc, and .xinitrc.

Hands-On Lab