.\" Copyright (c) 1993
.\"	The Regents of the University of California.  All rights reserved.
.\"
.\" %sccs.include.redist.roff%
.\"
.\"	@(#)uname.1	8.3 (Berkeley) %G%
.\"
.Dd ""
.Dt UNAME 1
.Os
.Sh NAME
.Nm uname
.Nd display information about the system
.Sh SYNOPSIS
.Nm uname
.Op Fl amnrsv
.Sh DESCRIPTION
The
.Nm uname
command writes the name of the operating system implementation to
standard output.
When options are specified, strings representing one or more system
characteristics are written to standard output.
.Pp
The options are as follows:
.Bl -tag -width Ds
.It Fl a
Behave as though the options
.Fl m ,
.Fl n ,
.Fl r ,
.Fl s ,
and
.Fl v
were specified.
.It Fl m
Write the type of the current hardware platform to standard output.
.It Fl n
Write the name of the system to standard output.
.It Fl r
Write the current release level of the operating system
to standard output.
.It Fl s
Write the name of the operating system implementation to standard output.
.It Fl v
Write the version level of this release of the operating system
to standard output.
.El
.Pp
If the
.Fl a
flag is specified, or multiple flags are specified, all
output is written on a single line, separated by spaces.
.Pp
The
.Nm uname
utility exits 0 on success, and >0 if an error occurs.
.Sh SEE ALSO
.Xr sysctl 8 ,
.Xr sysctl 3 ,
.Xr uname 3
.Sh HISTORY
The
.Nm uname
command appeared in 4.4BSD.
.Sh STANDARDS
The
.Nm uname
command is expected to conform to the
.St -p1003.2
specification.