NAME
which - locate a program file including aliases and paths (csh
only)

SYNOPSIS
which [ name ] ...

DESCRIPTION
Which takes a list of names and looks for the files which would be
executed had these names been given as commands. Each argument is
expanded if it is aliased, and searched for along the user’s path.
Both aliases and path are taken from the user’s .cshrc file.

FILES
~/.cshrc source of aliases and path values

DIAGNOSTICS
A diagnostic is given for names which are aliased to more than a
single word, or if an executable file with the argument name was
not found in the path.

BUGS
Must be executed by a csh, since only csh’s know about aliases.