command history

• type history to see your command history
• type !! to repeat your last command
• type !15 to repeat command #15 from your history
• type !gcc to repeat your last gcc compile command
• use the up and down arrow keys to move through your history list
• can use emacs commands (like ctrl-a, ctrl-e, ctrl-f, and ctrl-d) to edit a command
• can use vi, too, if you want (bash: set -o vi, tcsh: bindkey -v)