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WHICH(1) General Commands Manual WHICH(1)

whichlocate a program file (or files) in the path

which [-a] name ...

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 searched for along the user's path.

If the -a flag is given, which will return a list of all matches instead of just the first match.

The following environment variables affect the execution of which:

A colon-separated list of directories in which to find executables. If PATH is not set, and the given name is not a fully qualified or relative pathname, which will fail.

The which utility exits with one of the following values:

All names were successfully resolved.
Some names were resolved but not all.
No names were resolved.

A diagnostic is given if an executable file with the argument name was not found in the path.

csh(1), find(1), locate(1), whereis(1), environ(7)

which also exists as a built-in to csh(1), though with a different syntax.

A which command first appeared in 3.0BSD.

The -a option first appeared in OpenBSD 2.3.

August 14, 2013 OpenBSD-5.8