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.\" 3. All advertising materials mentioning features or use of this software 13.\" must display the following acknowledgement: 14.\" This product includes software developed by the University of 15.\" California, Berkeley and its contributors. 16.\" 4. Neither the name of the University nor the names of its contributors 17.\" may be used to endorse or promote products derived from this software 18.\" without specific prior written permission. 19.\" 20.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 21.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 24.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30.\" SUCH DAMAGE. 31.\" 32.\" @(#)uname.1 8.3 (Berkeley) 4/8/94 33.\" $FreeBSD: src/usr.bin/uname/uname.1,v 1.8.2.4 2002/10/17 07:47:29 jmallett Exp $ 34.\" $DragonFly: src/usr.bin/uname/uname.1,v 1.2 2003/06/17 04:29:33 dillon Exp $ 35.\" 36.Dd September 18, 2002 37.Dt UNAME 1 38.Os 39.Sh NAME 40.Nm uname 41.Nd display information about the system 42.Sh SYNOPSIS 43.Nm 44.Op Fl amnprsv 45.Sh DESCRIPTION 46The 47.Nm 48command writes the name of the operating system implementation to 49standard output. 50When options are specified, strings representing one or more system 51characteristics are written to standard output. 52.Pp 53The options are as follows: 54.Bl -tag -width indent 55.It Fl a 56Behave as though the options 57.Fl m , n , r , s , 58and 59.Fl v 60were specified. 61.It Fl m 62Write the type of the current hardware platform to standard output. 63.It Fl n 64Write the name of the system to standard output. 65.It Fl p 66Write the type of the machine processor architecture to standard output. 67.It Fl r 68Write the current release level of the operating system 69to standard output. 70.It Fl s 71Write the name of the operating system implementation to standard output. 72.It Fl v 73Write the version level of this release of the operating system 74to standard output. 75.El 76.Pp 77If the 78.Fl a 79flag is specified, or multiple flags are specified, all 80output is written on a single line, separated by spaces. 81.Sh DIAGNOSTICS 82.Ex -std 83.Sh ENVIRONMENT 84An environment variable composed of the string 85.Ev UNAME_ 86followed by any flag to the 87.Nm 88utility (except for 89.Fl a ) 90will allow the corresponding data to be set to the contents 91of the environment variable. 92.Sh SEE ALSO 93.Xr sysctl 3 , 94.Xr uname 3 , 95.Xr sysctl 8 96.Sh HISTORY 97The 98.Nm 99command appeared in PWB UNIX. 100.Sh STANDARDS 101The 102.Nm 103command is expected to conform to the 104.St -p1003.2 105specification. 106