1.\" $OpenBSD: which.1,v 1.24 2013/08/14 06:32:30 jmc Exp $ 2.\" 3.\" Copyright (c) 1980, 1991 Regents of the University of California. 4.\" All rights reserved. 5.\" 6.\" Redistribution and use in source and binary forms, with or without 7.\" modification, are permitted provided that the following conditions 8.\" are met: 9.\" 1. Redistributions of source code must retain the above copyright 10.\" notice, this list of conditions and the following disclaimer. 11.\" 2. Redistributions in binary form must reproduce the above copyright 12.\" notice, this list of conditions and the following disclaimer in the 13.\" documentation and/or other materials provided with the distribution. 14.\" 3. Neither the name of the University nor the names of its contributors 15.\" may be used to endorse or promote products derived from this software 16.\" without specific prior written permission. 17.\" 18.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 19.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 20.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 21.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 22.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 23.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 24.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 25.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 26.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 27.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 28.\" SUCH DAMAGE. 29.\" 30.\" from: @(#)which.1 6.3 (Berkeley) 4/23/91 31.\" 32.Dd $Mdocdate: August 14 2013 $ 33.Dt WHICH 1 34.Os 35.Sh NAME 36.Nm which 37.Nd locate a program file (or files) in the path 38.Sh SYNOPSIS 39.Nm which 40.Op Fl a 41.Ar name ... 42.Sh DESCRIPTION 43.Nm 44takes a list of names and looks for the files which would be 45executed had these names been given as commands. 46Each argument is searched for along the user's path. 47.Pp 48If the 49.Fl a 50flag is given, 51.Nm 52will return a list of all matches instead of just the first match. 53.Sh ENVIRONMENT 54The following environment variables affect the execution of 55.Nm which : 56.Bl -tag -width PATH 57.It Ev PATH 58A colon-separated list of directories in which to find executables. 59If 60.Ev PATH 61is not set, and the given name is not a fully qualified 62or relative pathname, 63.Nm 64will fail. 65.El 66.Sh EXIT STATUS 67The 68.Nm 69utility exits with one of the following values: 70.Pp 71.Bl -tag -width Ds -offset indent -compact 72.It 0 73All names were successfully resolved. 74.It 1 75Some names were resolved but not all. 76.It 2 77No names were resolved. 78.El 79.Sh DIAGNOSTICS 80A diagnostic is given if an executable file with the argument 81name was not found in the path. 82.Sh SEE ALSO 83.Xr csh 1 , 84.Xr find 1 , 85.Xr locate 1 , 86.Xr whereis 1 , 87.Xr environ 7 88.Sh STANDARDS 89.Nm 90also exists as a built-in to 91.Xr csh 1 , 92though with a different syntax. 93.Sh HISTORY 94A 95.Nm 96command first appeared in 97.Bx 3.0 . 98.Pp 99The 100.Fl a 101option first appeared in 102.Ox 2.3 . 103