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Mac OS X Tiger in a Nutshell by Jason McIntosh, Chuck Toporek, Chris Stone, Andy Lester

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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

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