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.Dd September 14, 2022 29.Dt UNAME 1 30.Os 31.Sh NAME 32.Nm uname 33.Nd display information about the system 34.Sh SYNOPSIS 35.Nm 36.Op Fl abiKmnoprsUv 37.Sh DESCRIPTION 38The 39.Nm 40command writes the name of the operating system implementation to 41standard output. 42When options are specified, strings representing one or more system 43characteristics are written to standard output. 44.Pp 45The options are as follows: 46.Bl -tag -width indent 47.It Fl a 48Behave as though the options 49.Fl m , n , r , s , 50and 51.Fl v 52were specified. 53.It Fl b 54Write the kernel's linker-generated build-id to standard output. 55.It Fl i 56Write the kernel ident to standard output. 57.It Fl K 58Write the 59.Fx 60version of the kernel. 61.It Fl m 62Write the type of the current hardware platform to standard output. 63.Po Xr make 1 64uses it to set the 65.Va MACHINE 66variable. 67.Pc 68.It Fl n 69Write the name of the system to standard output. 70.It Fl o 71This is a synonym for the 72.Fl s 73option, for compatibility with other systems. 74.It Fl p 75Write the type of the machine processor architecture to standard output. 76.Po Xr make 1 77uses it to set the 78.Va MACHINE_ARCH 79variable. 80.Pc 81.It Fl r 82Write the current release level of the kernel 83to standard output. 84.Xr freebsd-version 1 85can be used to print the release level of the userland. 86.It Fl s 87Write the name of the operating system implementation to standard output. 88.It Fl U 89Write the 90.Fx 91version of the user environment. 92.It Fl v 93Write the version level of this release of the operating system 94to standard output. 95.El 96.Pp 97If the 98.Fl a 99flag is specified, or multiple flags are specified, all 100output is written on a single line, separated by spaces. 101.Pp 102The 103.Fl K 104and 105.Fl U 106flags are intended to be used for fine grain differentiation of incremental 107.Fx 108development and user visible changes. 109Note that when both of these two options are specified, regardless of their 110order, the kernel version would be printed first, followed by the user 111environment version. 112.Sh ENVIRONMENT 113An environment variable composed of the string 114.Ev UNAME_ 115followed by any flag to the 116.Nm 117utility (except for 118.Fl a ) 119will allow the corresponding data to be set to the contents 120of the environment variable. 121See 122.Xr uname 3 123for more information. 124.Sh EXIT STATUS 125.Ex -std 126.Sh EXAMPLES 127The hardware platform 128.Pq Fl m 129can be different from the machine's processor architecture 130.Pq Fl p , 131e.g., on 64-bit PowerPC, 132.Fl m 133would return 134.Va powerpc 135and 136.Fl p 137would return 138.Va powerpc64 . 139.Sh SEE ALSO 140.Xr freebsd-version 1 , 141.Xr feature_present 3 , 142.Xr getosreldate 3 , 143.Xr sysctl 3 , 144.Xr uname 3 , 145.Xr sysctl 8 146.Sh STANDARDS 147The 148.Nm 149command is expected to conform to the 150.St -p1003.2 151specification. 152.Sh HISTORY 153The 154.Nm 155command appeared in PWB UNIX 1.0, however 156.Bx 4.4 157was the first Berkeley release with the 158.Nm 159command. 160.Pp 161The 162.Fl K 163and 164.Fl U 165extension flags appeared in 166.Fx 10.0 . 167The 168.Fl b 169extension flag appeared in 170.Fx 13.0 . 171