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.\" $OpenBSD: what.1,v 1.20 2019/01/20 14:03:19 schwarze Exp $
.\" $NetBSD: what.1,v 1.3 1994/11/17 06:59:38 jtc Exp $
.\"
.\" Copyright (c) 1980, 1991, 1993
.\" The Regents of the University of California. All rights reserved.
.\"
.\" Redistribution and use in source and binary forms, with or without
.\" modification, are permitted provided that the following conditions
.\" are met:
.\" 1. Redistributions of source code must retain the above copyright
.\" notice, this list of conditions and the following disclaimer.
.\" 2. Redistributions in binary form must reproduce the above copyright
.\" notice, this list of conditions and the following disclaimer in the
.\" documentation and/or other materials provided with the distribution.
.\" 3. Neither the name of the University nor the names of its contributors
.\" may be used to endorse or promote products derived from this software
.\" without specific prior written permission.
.\"
.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
.\" SUCH DAMAGE.
.\"
.\" @(#)what.1 8.1 (Berkeley) 6/6/93
.\"
.Dd $Mdocdate: January 20 2019 $
.Dt WHAT 1
.Os
.Sh NAME
.Nm what
.Nd show what versions of object modules were used to construct a file
.Sh SYNOPSIS
.Nm what
.Op Fl s
.Ar
.Sh DESCRIPTION
.Nm
reads each
.Ar file
and searches for sequences of either the form
.Sq $
immediately followed by the system name (sysname) as defined by
.Xr uname 3 ,
or the form
.Dq @(#)
as inserted by the source code control system (SCCS).
.Pp
When
.Sq $
followed by the system name is encountered
.Nm
prints the remainder of the string up to a
.Sq $
or any non-printable character.
.Pp
When
.Dq @(#)
is encountered
.Nm
prints the remainder of the string, up to a NUL, newline, double
quote, backslash, or
.Sq >
character.
.Pp
If the
.Fl s
option is specified, only the first occurrence of an identification string in
each file is printed.
.Sh EXIT STATUS
The
.Nm
utility exits with a return value of 0 if any identification strings were found,
or with a return value of 1 otherwise.
.Sh STANDARDS
The
.Nm
utility is compliant with the
X/Open System Interfaces option of the
.St -p1003.1-2008
specification.
.Pp
Processing $sysname$ sequences is an
.Ox
extension.
.Sh HISTORY
The
.Nm
command first appeared in the SCCS package and was rewritten for
.Bx 4.0
for licensing reasons.
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