1.\" Copyright (c) 1993 2.\" The Regents of the University of California. All rights reserved. 3.\" 4.\" Redistribution and use in source and binary forms, with or without 5.\" modification, are permitted provided that the following conditions 6.\" are met: 7.\" 1. Redistributions of source code must retain the above copyright 8.\" notice, this list of conditions and the following disclaimer. 9.\" 2. Redistributions in binary form must reproduce the above copyright 10.\" notice, this list of conditions and the following disclaimer in the 11.\" documentation and/or other materials provided with the distribution. 12.\" 4. Neither the name of the University nor the names of its contributors 13.\" may be used to endorse or promote products derived from this software 14.\" without specific prior written permission. 15.\" 16.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 17.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 20.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26.\" SUCH DAMAGE. 27.\" 28.\" @(#)uname.1 8.3 (Berkeley) 4/8/94 29.\" $FreeBSD: src/usr.bin/uname/uname.1,v 1.8.2.4 2002/10/17 07:47:29 jmallett Exp $ 30.\" $DragonFly: src/usr.bin/uname/uname.1,v 1.5 2007/07/30 22:11:33 swildner Exp $ 31.\" 32.Dd October 24, 2003 33.Dt UNAME 1 34.Os 35.Sh NAME 36.Nm uname 37.Nd display information about the system 38.Sh SYNOPSIS 39.Nm 40.Op Fl aimnprsv 41.Sh DESCRIPTION 42The 43.Nm 44command writes the name of the operating system implementation to 45standard output. 46When options are specified, strings representing one or more system 47characteristics are written to standard output. 48.Pp 49The options are as follows: 50.Bl -tag -width indent 51.It Fl a 52Behave as though the options 53.Fl m , n , r , s , 54and 55.Fl v 56were specified. 57.It Fl i 58Write the kernel ident to standard output. 59.It Fl m 60Write the type of the current hardware platform to standard output. 61.It Fl n 62Write the name of the system to standard output. 63.It Fl p 64Write the type of the machine processor architecture to standard output. 65.It Fl r 66Write the current release level of the operating system 67to standard output. 68.It Fl s 69Write the name of the operating system implementation to standard output. 70.It Fl v 71Write the version level of this release of the operating system 72to standard output. 73.El 74.Pp 75If the 76.Fl a 77flag is specified, or multiple flags are specified, all 78output is written on a single line, separated by spaces. 79.Sh ENVIRONMENT 80An environment variable composed of the string 81.Ev UNAME_ 82followed by any flag to the 83.Nm 84utility (except for 85.Fl a ) 86will allow the corresponding data to be set to the contents 87of the environment variable. 88.Pp 89A varsym composed of the string 90.Ev UNAME_ 91followed by any flag to the 92.Nm 93utility (except for 94.Fl a ) 95will allow the corresponding data to be set from the contents 96of the varsym. 97Environment variables override varsyms in this case. 98.Sh EXIT STATUS 99.Ex -std 100.Sh SEE ALSO 101.Xr varsym 1 , 102.Xr sysctl 3 , 103.Xr uname 3 , 104.Xr sysctl 8 105.Sh STANDARDS 106The 107.Nm 108command is expected to conform to the 109.St -p1003.2 110specification. 111.Sh HISTORY 112The 113.Nm 114command appeared in PWB 115.Ux . 116