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: 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 July 8, 2021 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 aiKmnprsUvP 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 K 60Write the 61.Dx 62version of the kernel. 63.It Fl m 64Write the type of the current hardware platform to standard output. 65.It Fl n 66Write the name of the system to standard output. 67.It Fl p 68Write the type of the machine processor architecture to standard output. 69.It Fl r 70Write the current release level of the operating system 71to standard output. 72.It Fl s 73Write the name of the operating system implementation to standard output. 74.It Fl U 75Write the 76.Dx 77version of the user environment. 78.It Fl v 79Write the version level of this release of the operating system 80to standard output. 81.It Fl P 82Generates a default ABI: configuration string for dports / pkgng to 83the standard output, including odd-to-even version-munging. 84.It Fl PP 85Generates a default ABI: configuration string for dports / pkgng to 86the standard output, without version-munging. 87.El 88.Pp 89If the 90.Fl a 91flag is specified, or multiple flags are specified, all 92output is written on a single line, separated by spaces. 93.Pp 94The 95.Fl K 96and 97.Fl U 98flags are intended to be used for fine grain differentiation of incremental 99.Dx 100development and user visible changes. 101.Sh ENVIRONMENT 102An environment variable composed of the string 103.Ev UNAME_ 104followed by any flag to the 105.Nm 106utility (except for 107.Fl a ) 108will allow the corresponding data to be set to the contents 109of the environment variable. 110.Pp 111A varsym composed of the string 112.Ev UNAME_ 113followed by any flag to the 114.Nm 115utility (except for 116.Fl a ) 117will allow the corresponding data to be set from the contents 118of the varsym. 119Environment variables override varsyms in this case. 120.Sh EXIT STATUS 121.Ex -std 122.Sh SEE ALSO 123.Xr varsym 1 , 124.Xr sysctl 3 , 125.Xr uname 3 , 126.Xr sysctl 8 127.Sh STANDARDS 128The 129.Nm 130command is expected to conform to the 131.St -p1003.2 132specification. 133.Sh HISTORY 134The 135.Nm 136command appeared in PWB 137.Ux . 138