When you run Terminal in OS X 10.3 or 10.4, you’re working with something called the bash shell (in 10.2 and earlier, Terminal used the tcsh shell ... the command line would read cd /Library ...

The “set filec” command is generally put in one of the user’s startup files (e.g., ~/.cshrc) so that the user doesn’t need to remember to type it on the command line whenever he logs in or ...