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. 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 November 20, 2013 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 aiKmnoprsUv 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 K 59Write the 60.Fx 61version of the kernel. 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 o 67This is a synonym for the 68.Fl s 69option, for compatibility with other systems. 70.It Fl p 71Write the type of the machine processor architecture to standard output. 72.It Fl r 73Write the current release level of the operating system 74to standard output. 75.It Fl s 76Write the name of the operating system implementation to standard output. 77.It Fl U 78Write the 79.Fx 80version of the user environment. 81.It Fl v 82Write the version level of this release of the operating system 83to standard output. 84.El 85.Pp 86If the 87.Fl a 88flag is specified, or multiple flags are specified, all 89output is written on a single line, separated by spaces. 90.Pp 91The 92.Fl K 93and 94.Fl U 95flags are intended to be used for fine grain differentiation of incremental 96.Fx 97development and user visible changes. 98.Sh ENVIRONMENT 99An environment variable composed of the string 100.Ev UNAME_ 101followed by any flag to the 102.Nm 103utility (except for 104.Fl a ) 105will allow the corresponding data to be set to the contents 106of the environment variable. 107.Sh EXIT STATUS 108.Ex -std 109.Sh SEE ALSO 110.Xr feature_present 3 , 111.Xr getosreldate 3 , 112.Xr sysctl 3 , 113.Xr uname 3 , 114.Xr sysctl 8 115.Sh STANDARDS 116The 117.Nm 118command is expected to conform to the 119.St -p1003.2 120specification. 121.Sh HISTORY 122The 123.Nm 124command appeared in PWB UNIX. 125.Pp 126The 127.Fl K 128and 129.Fl U 130extension flags appeared in 131.Fx 10.0 . 132