Intro Command Line

Outline for "Introduction to the Command Line"

Commands are 1) executed 2) in a shell 3) with options

How to check options:

• man
• info

Filesystem Hierarchy Standard

• hierarchy starts with /
• any path starting with / starts from the root
• any path starts with not / starts from the current directory

Files and Directories

• pwd
• cd
• ls ( and options)
• find

Display Text

• echo
• cat
• less
• tail -f
• grep
• sort
• uniq

Shell

• bash
• sh, csh, cmd.exe

Shell Functions

• variables and export
• stdin, stdout, stderr
• Redirection with < > |
• shell builtins (type -f cd)
• tab completion
• history, !2, !!
• key shortcuts: alt-. ctrl-r ^^ ctrl-a, ctrl-e

Advanced Topics

• shell scripting, "shebang"
• echo $$ (pid), $? (exit code)
• jobs and processes
• device files