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126 lines
3.5 KiB
Groff
126 lines
3.5 KiB
Groff
.\" Manpage Copyright (c) 1995, Jordan Hubbard <jkh@FreeBSD.org>
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\" 3. All advertising materials mentioning features or use of this software
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.\" must display the following acknowledgement:
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.\" This product includes software developed by the FreeBSD Project
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.\" its contributors.
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.\" 4. Neither the name of the FreeBSD Project nor the names of its contributors
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.\" may be used to endorse or promote products derived from this software
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.\" without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE CONTRIBUTOR ``AS IS'' AND ANY EXPRESS OR
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.\" IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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.\" OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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.\" IN NO EVENT SHALL THE CONTRIBUTOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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.\" INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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.\" NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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.\" DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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.\" THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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.\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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.\" OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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.\"
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.Dd September 24, 2020
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.Dt WHICH 1
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.Os
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.Sh NAME
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.Nm which
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.Nd "locate a program file in the user's path"
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.Sh SYNOPSIS
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.Nm
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.Op Fl as
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.Ar program ...
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.Sh DESCRIPTION
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The
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.Nm
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utility
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takes a list of command names and searches the path for each executable
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file that would be run had these commands actually been invoked.
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.Pp
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The following options are available:
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.Bl -tag -width indent
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.It Fl a
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List all instances of executables found (instead of just the first one
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of each).
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.It Fl s
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No output, just return 0 if all of the executables are found, or 1 if
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some were not found.
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.El
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.Pp
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Some shells may provide a builtin
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.Nm
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command which is similar or identical to this utility.
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Consult the
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.Xr builtin 1
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manual page.
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.Sh EXAMPLES
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Locate the
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.Xr ls 1
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and
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.Xr cp 1
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commands:
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.Bd -literal -offset indent
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$ /usr/bin/which ls cp
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/bin/ls
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/bin/cp
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.Ed
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.Pp
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Same as above with a specific
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.Ev PATH
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and showing all occurrences:
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.Bd -literal -offset indent
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$ PATH=/bin:/rescue /usr/bin/which -a ls cp
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/bin/ls
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/rescue/ls
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/bin/cp
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/rescue/cp
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.Ed
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.Pp
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.Nm which
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will show duplicates if the same executable is found more than once:
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.Bd -literal -offset indent
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$ PATH=/bin:/bin /usr/bin/which -a ls
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/bin/ls
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/bin/ls
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.Ed
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.Pp
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Do not show output.
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Just exit with an appropriate return code:
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.Bd -literal -offset indent
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$ /usr/bin/which -s ls cp
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$ echo $?
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0
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$ /usr/bin/which -s fakecommand
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$ echo $?
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1
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.Ed
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.Sh SEE ALSO
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.Xr builtin 1 ,
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.Xr csh 1 ,
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.Xr find 1 ,
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.Xr locate 1 ,
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.Xr whereis 1
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.Sh HISTORY
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The
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.Nm
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command first appeared in
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.Fx 2.1 .
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.Sh AUTHORS
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.An -nosplit
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The
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.Nm
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utility was originally written in Perl and was contributed by
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.An Wolfram Schneider Aq Mt wosch@FreeBSD.org .
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The current version of
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.Nm
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was rewritten in C by
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.An Daniel Papasian Aq Mt dpapasia@andrew.cmu.edu .
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