1.\"	$OpenBSD: what.1,v 1.20 2019/01/20 14:03:19 schwarze Exp $
2.\"	$NetBSD: what.1,v 1.3 1994/11/17 06:59:38 jtc Exp $
3.\"
4.\" Copyright (c) 1980, 1991, 1993
5.\"	The Regents of the University of California.  All rights reserved.
6.\"
7.\" Redistribution and use in source and binary forms, with or without
8.\" modification, are permitted provided that the following conditions
9.\" are met:
10.\" 1. Redistributions of source code must retain the above copyright
11.\"    notice, this list of conditions and the following disclaimer.
12.\" 2. Redistributions in binary form must reproduce the above copyright
13.\"    notice, this list of conditions and the following disclaimer in the
14.\"    documentation and/or other materials provided with the distribution.
15.\" 3. Neither the name of the University nor the names of its contributors
16.\"    may be used to endorse or promote products derived from this software
17.\"    without specific prior written permission.
18.\"
19.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29.\" SUCH DAMAGE.
30.\"
31.\"     @(#)what.1	8.1 (Berkeley) 6/6/93
32.\"
33.Dd $Mdocdate: January 20 2019 $
34.Dt WHAT 1
35.Os
36.Sh NAME
37.Nm what
38.Nd show what versions of object modules were used to construct a file
39.Sh SYNOPSIS
40.Nm what
41.Op Fl s
42.Ar
43.Sh DESCRIPTION
44.Nm
45reads each
46.Ar file
47and searches for sequences of either the form
48.Sq $
49immediately followed by the system name (sysname) as defined by
50.Xr uname 3 ,
51or the form
52.Dq @(#)
53as inserted by the source code control system (SCCS).
54.Pp
55When
56.Sq $
57followed by the system name is encountered
58.Nm
59prints the remainder of the string up to a
60.Sq $
61or any non-printable character.
62.Pp
63When
64.Dq @(#)
65is encountered
66.Nm
67prints the remainder of the string, up to a NUL, newline, double
68quote, backslash, or
69.Sq >
70character.
71.Pp
72If the
73.Fl s
74option is specified, only the first occurrence of an identification string in
75each file is printed.
76.Sh EXIT STATUS
77The
78.Nm
79utility exits with a return value of 0 if any identification strings were found,
80or with a return value of 1 otherwise.
81.Sh STANDARDS
82The
83.Nm
84utility is compliant with the
85X/Open System Interfaces option of the
86.St -p1003.1-2008
87specification.
88.Pp
89Processing $sysname$ sequences is an
90.Ox
91extension.
92.Sh HISTORY
93The
94.Nm
95command first appeared in the SCCS package and was rewritten for
96.Bx 4.0
97for licensing reasons.
98