.\"	$OpenBSD: which.1,v 1.8 1998/10/30 00:24:43 aaron Exp $
.\" Copyright (c) 1980, 1991 Regents of the University of California.
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.\"    must display the following acknowledgement:
.\"	This product includes software developed by the University of
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.\"     from: @(#)which.1	6.3 (Berkeley) 4/23/91
.\"
.Dd February 21, 1997
.Dt WHICH 1
.Os
.Sh NAME
.Nm which
.Nd "locate a program file (or files) in the path"
.Sh SYNOPSIS
.Nm which
.Op Fl a
.Ar name Op Ar ...
.Sh DESCRIPTION
.Nm 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.
.Pp
If the
.Fl a
flag is given,
.Nm
will return a list of all matches instead of just the first match.
.Sh RETURN VALUES
The
.Nm
utility exits with one of the following values:
.Bl -tag -width 4n
.It 0
All names were successfully resolved.
.It 1
Some names were resolved but not all.
.It 2
No names were resolved.
.It -1
A system error occurred.
.El
.Sh DIAGNOSTICS
A diagnostic is given if an executable file with the argument
name was not found in the path.
.Sh ENVIRONMENT
.Bl -tag -width PATH
.It Ev PATH
.Nm
uses the environment variable
.Ev PATH
as a colon-separated list of directories in which to find executables.
If
.Ev PATH
is not set, and the given name is not a fully-qualified
or relative pathname,
.Nm
will fail.
.El
.Sh CAVEATS
The
.Nm
command formerly was a
.Xr csh 1
script and could expand aliases.
.Xr csh 1
now has a built-in
.Nm
comand so this version is intended for use
with other shells like
.Xr sh 1 .
.Sh SEE ALSO
.Xr csh 1 ,
.Xr sh 1 ,
.Xr whereis 1 ,
.Xr environ 7
.Sh HISTORY
A
.Nm
command appeared in
.Bx 3.0 .