Shell Variables & Aliases, Cont'd

There are certain special variables.
- E.g. PATH contains a list of directories to search for commands
Aliases allow you to define new commands.
- E.g. alias rm rm -i [make rm ask for confirmation]
Variables and aliases that you use all the time can be defined in your "startup" file.
- E.g. in tcsh, ~/.tcshrc is your startup script

There are certain special variables.