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.\" 30.Dd September 14, 2022 31.Dt UNAME 1 32.Os 33.Sh NAME 34.Nm uname 35.Nd display information about the system 36.Sh SYNOPSIS 37.Nm 38.Op Fl abiKmnoprsUv 39.Sh DESCRIPTION 40The 41.Nm 42command writes the name of the operating system implementation to 43standard output. 44When options are specified, strings representing one or more system 45characteristics are written to standard output. 46.Pp 47The options are as follows: 48.Bl -tag -width indent 49.It Fl a 50Behave as though the options 51.Fl m , n , r , s , 52and 53.Fl v 54were specified. 55.It Fl b 56Write the kernel's linker-generated build-id to standard output. 57.It Fl i 58Write the kernel ident to standard output. 59.It Fl K 60Write the 61.Fx 62version of the kernel. 63.It Fl m 64Write the type of the current hardware platform to standard output. 65.Po Xr make 1 66uses it to set the 67.Va MACHINE 68variable. 69.Pc 70.It Fl n 71Write the name of the system to standard output. 72.It Fl o 73This is a synonym for the 74.Fl s 75option, for compatibility with other systems. 76.It Fl p 77Write the type of the machine processor architecture to standard output. 78.Po Xr make 1 79uses it to set the 80.Va MACHINE_ARCH 81variable. 82.Pc 83.It Fl r 84Write the current release level of the kernel 85to standard output. 86.Xr freebsd-version 1 87can be used to print the release level of the userland. 88.It Fl s 89Write the name of the operating system implementation to standard output. 90.It Fl U 91Write the 92.Fx 93version of the user environment. 94.It Fl v 95Write the version level of this release of the operating system 96to standard output. 97.El 98.Pp 99If the 100.Fl a 101flag is specified, or multiple flags are specified, all 102output is written on a single line, separated by spaces. 103.Pp 104The 105.Fl K 106and 107.Fl U 108flags are intended to be used for fine grain differentiation of incremental 109.Fx 110development and user visible changes. 111Note that when both of these two options are specified, regardless of their 112order, the kernel version would be printed first, followed by the user 113environment version. 114.Sh ENVIRONMENT 115An environment variable composed of the string 116.Ev UNAME_ 117followed by any flag to the 118.Nm 119utility (except for 120.Fl a ) 121will allow the corresponding data to be set to the contents 122of the environment variable. 123See 124.Xr uname 3 125for more information. 126.Sh EXIT STATUS 127.Ex -std 128.Sh EXAMPLES 129The hardware platform 130.Pq Fl m 131can be different from the machine's processor architecture 132.Pq Fl p , 133e.g., on 64-bit PowerPC, 134.Fl m 135would return 136.Va powerpc 137and 138.Fl p 139would return 140.Va powerpc64 . 141.Sh SEE ALSO 142.Xr freebsd-version 1 , 143.Xr feature_present 3 , 144.Xr getosreldate 3 , 145.Xr sysctl 3 , 146.Xr uname 3 , 147.Xr sysctl 8 148.Sh STANDARDS 149The 150.Nm 151command is expected to conform to the 152.St -p1003.2 153specification. 154.Sh HISTORY 155The 156.Nm 157command appeared in PWB UNIX 1.0, however 158.Bx 4.4 159was the first Berkeley release with the 160.Nm 161command. 162.Pp 163The 164.Fl K 165and 166.Fl U 167extension flags appeared in 168.Fx 10.0 . 169The 170.Fl b 171extension flag appeared in 172.Fx 13.0 . 173