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.\" $FreeBSD$ 30.\" 31.Dd January 26, 2010 32.Dt UNAME 1 33.Os 34.Sh NAME 35.Nm uname 36.Nd display information about the system 37.Sh SYNOPSIS 38.Nm 39.Op Fl aimnoprsv 40.Sh DESCRIPTION 41The 42.Nm 43command writes the name of the operating system implementation to 44standard output. 45When options are specified, strings representing one or more system 46characteristics are written to standard output. 47.Pp 48The options are as follows: 49.Bl -tag -width indent 50.It Fl a 51Behave as though the options 52.Fl m , n , r , s , 53and 54.Fl v 55were specified. 56.It Fl i 57Write the kernel ident to standard output. 58.It Fl m 59Write the type of the current hardware platform to standard output. 60.It Fl n 61Write the name of the system to standard output. 62.It Fl o 63This is a synonym for the 64.Fl s 65option, for compatibility with other systems. 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