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 May 31, 2017 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.Po Xr make 1 65uses it to set the 66.Va MACHINE 67variable. 68.Pc 69.It Fl n 70Write the name of the system to standard output. 71.It Fl o 72This is a synonym for the 73.Fl s 74option, for compatibility with other systems. 75.It Fl p 76Write the type of the machine processor architecture to standard output. 77.Po Xr make 1 78uses it to set the 79.Va MACHINE_ARCH 80variable. 81.Pc 82.It Fl r 83Write the current release level of the operating system 84to standard output. 85.It Fl s 86Write the name of the operating system implementation to standard output. 87.It Fl U 88Write the 89.Fx 90version of the user environment. 91.It Fl v 92Write the version level of this release of the operating system 93to standard output. 94.El 95.Pp 96If the 97.Fl a 98flag is specified, or multiple flags are specified, all 99output is written on a single line, separated by spaces. 100.Pp 101The 102.Fl K 103and 104.Fl U 105flags are intended to be used for fine grain differentiation of incremental 106.Fx 107development and user visible changes. 108.Sh ENVIRONMENT 109An environment variable composed of the string 110.Ev UNAME_ 111followed by any flag to the 112.Nm 113utility (except for 114.Fl a ) 115will allow the corresponding data to be set to the contents 116of the environment variable. 117.Sh EXIT STATUS 118.Ex -std 119.Sh EXAMPLES 120The hardware platform 121.Pq Fl m 122can be different from the machine's processor architecture 123.Pq Fl p , 124e.g., on 64-bit PowerPC, 125.Fl m 126would return 127.Va powerpc 128and 129.Fl p 130would return 131.Va powerpc64 . 132.Sh SEE ALSO 133.Xr feature_present 3 , 134.Xr getosreldate 3 , 135.Xr sysctl 3 , 136.Xr uname 3 , 137.Xr sysctl 8 138.Sh STANDARDS 139The 140.Nm 141command is expected to conform to the 142.St -p1003.2 143specification. 144.Sh HISTORY 145The 146.Nm 147command appeared in PWB UNIX. 148.Pp 149The 150.Fl K 151and 152.Fl U 153extension flags appeared in 154.Fx 10.0 . 155