Mac OS X Tiger in a Nutshell

Name

which

Synopsis

which [commands]

Lists which files are executed if the named commands are run as a command. which reads the user’s .cshrc file (using the source built-in command), checking aliases and searching the path variable. Users of the Bourne or Korn shells can use the built-in type command as an alternative.

Example

$ which file ls
/usr/bin/file
ls:      aliased to ls -sFC