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.\" $FreeBSD$ 34.\" 35.Dd April 2, 2003 36.Dt UNAME 1 37.Os 38.Sh NAME 39.Nm uname 40.Nd display information about the system 41.Sh SYNOPSIS 42.Nm 43.Op Fl aimnprsv 44.Sh DESCRIPTION 45The 46.Nm 47command writes the name of the operating system implementation to 48standard output. 49When options are specified, strings representing one or more system 50characteristics are written to standard output. 51.Pp 52The options are as follows: 53.Bl -tag -width indent 54.It Fl a 55Behave as though the options 56.Fl m , n , r , s , 57and 58.Fl v 59were specified. 60.It Fl i 61Write the kernel ident to standard output. 62.It Fl m 63Write the type of the current hardware platform to standard output. 64.It Fl n 65Write the name of the system to standard output. 66.It Fl p 67Write the type of the machine processor architecture to standard output. 68.It Fl r 69Write the current release level of the operating system 70to standard output. 71.It Fl s 72Write the name of the operating system implementation to standard output. 73.It Fl v 74Write the version level of this release of the operating system 75to standard output. 76.El 77.Pp 78If the 79.Fl a 80flag is specified, or multiple flags are specified, all 81output is written on a single line, separated by spaces. 82.Sh ENVIRONMENT 83An environment variable composed of the string 84.Ev UNAME_ 85followed by any flag to the 86.Nm 87utility (except for 88.Fl a ) 89will allow the corresponding data to be set to the contents 90of the environment variable. 91.Sh EXIT STATUS 92.Ex -std 93.Sh SEE ALSO 94.Xr sysctl 3 , 95.Xr uname 3 , 96.Xr sysctl 8 97.Sh STANDARDS 98The 99.Nm 100command is expected to conform to the 101.St -p1003.2 102specification. 103.Sh HISTORY 104The 105.Nm 106command appeared in PWB UNIX. 107