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.\" $OpenBSD: uname.1,v 1.17 2011/10/21 14:48:02 ajacoutot Exp $
.\"
.\" Copyright (c) 1990 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.
.\"
.\" from: @(#)du.1 6.13 (Berkeley) 6/20/91
.\"
.Dd $Mdocdate: October 21 2011 $
.Dt UNAME 1
.Os
.Sh NAME
.Nm uname
.Nd print operating system name
.Sh SYNOPSIS
.Nm uname
.Op Fl amnprsv
.Sh DESCRIPTION
The
.Nm uname
utility writes symbols representing one or more system characteristics
to the standard output.
.Pp
The options are as follows:
.Bl -tag -width Ds
.It Fl a
Behave as though all of the options
.Fl mnrsv
were specified.
.It Fl m
Print the machine hardware name.
.It Fl n
Print the nodename (the nodename may be a name
that the system is known by to a communications
network).
.It Fl p
Print the machine processor architecture name.
.It Fl r
Print the operating system release.
.It Fl s
Print the operating system name.
.It Fl v
Print the operating system version.
.El
.Pp
If no options are specified,
.Nm uname
prints the operating system name as if the
.Fl s
option had been specified.
.Sh EXIT STATUS
.Ex -std uname
.Sh SEE ALSO
.Xr hostname 1 ,
.Xr machine 1 ,
.Xr uname 3
.Sh STANDARDS
The
.Nm
utility is compliant with the
.St -p1003.1-2008
specification.
.Pp
The flag
.Op Fl p
is an extension to that specification.
.Sh HISTORY
The
.Nm
command appeared in
.Bx 4.4 .
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