1.\" $OpenBSD: which.1,v 1.9 1999/05/12 13:26:52 aaron Exp $ 2.\" Copyright (c) 1980, 1991 Regents of the University of California. 3.\" All rights reserved. 4.\" 5.\" Redistribution and use in source and binary forms, with or without 6.\" modification, are permitted provided that the following conditions 7.\" are met: 8.\" 1. Redistributions of source code must retain the above copyright 9.\" notice, this list of conditions and the following disclaimer. 10.\" 2. Redistributions in binary form must reproduce the above copyright 11.\" notice, this list of conditions and the following disclaimer in the 12.\" documentation and/or other materials provided with the distribution. 13.\" 3. All advertising materials mentioning features or use of this software 14.\" must display the following acknowledgement: 15.\" This product includes software developed by the University of 16.\" California, Berkeley and its contributors. 17.\" 4. Neither the name of the University nor the names of its contributors 18.\" may be used to endorse or promote products derived from this software 19.\" without specific prior written permission. 20.\" 21.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31.\" SUCH DAMAGE. 32.\" 33.\" from: @(#)which.1 6.3 (Berkeley) 4/23/91 34.\" 35.Dd February 21, 1997 36.Dt WHICH 1 37.Os 38.Sh NAME 39.Nm which 40.Nd "locate a program file (or files) in the path" 41.Sh SYNOPSIS 42.Nm which 43.Op Fl a 44.Ar name Op Ar ... 45.Sh DESCRIPTION 46.Nm which 47takes a list of names and looks for the files which would be 48executed had these names been given as commands. 49Each argument is searched for along the user's path. 50.Pp 51If the 52.Fl a 53flag is given, 54.Nm 55will return a list of all matches instead of just the first match. 56.Sh RETURN VALUES 57The 58.Nm 59utility exits with one of the following values: 60.Bl -tag -width 4n 61.It 0 62All names were successfully resolved. 63.It 1 64Some names were resolved but not all. 65.It 2 66No names were resolved. 67.It -1 68A system error occurred. 69.El 70.Sh DIAGNOSTICS 71A diagnostic is given if an executable file with the argument 72name was not found in the path. 73.Sh ENVIRONMENT 74.Bl -tag -width PATH 75.It Ev PATH 76.Nm 77uses the environment variable 78.Ev PATH 79as a colon-separated list of directories in which to find executables. 80If 81.Ev PATH 82is not set, and the given name is not a fully qualified 83or relative pathname, 84.Nm 85will fail. 86.El 87.Sh CAVEATS 88The 89.Nm 90command formerly was a 91.Xr csh 1 92script and could expand aliases. 93.Xr csh 1 94now has a built-in 95.Nm 96comand so this version is intended for use 97with other shells like 98.Xr sh 1 . 99.Sh SEE ALSO 100.Xr csh 1 , 101.Xr sh 1 , 102.Xr whereis 1 , 103.Xr environ 7 104.Sh HISTORY 105A 106.Nm 107command appeared in 108.Bx 3.0 . 109