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 August 10, 2020 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 abiKmnoprsUv 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 b 57Write the kernel's linker-generated build-id to standard output. 58.It Fl i 59Write the kernel ident to standard output. 60.It Fl K 61Write the 62.Fx 63version of the kernel. 64.It Fl m 65Write the type of the current hardware platform to standard output. 66.Po Xr make 1 67uses it to set the 68.Va MACHINE 69variable. 70.Pc 71.It Fl n 72Write the name of the system to standard output. 73.It Fl o 74This is a synonym for the 75.Fl s 76option, for compatibility with other systems. 77.It Fl p 78Write the type of the machine processor architecture to standard output. 79.Po Xr make 1 80uses it to set the 81.Va MACHINE_ARCH 82variable. 83.Pc 84.It Fl r 85Write the current release level of the operating system 86to standard output. 87.It Fl s 88Write the name of the operating system implementation to standard output. 89.It Fl U 90Write the 91.Fx 92version of the user environment. 93.It Fl v 94Write the version level of this release of the operating system 95to standard output. 96.El 97.Pp 98If the 99.Fl a 100flag is specified, or multiple flags are specified, all 101output is written on a single line, separated by spaces. 102.Pp 103The 104.Fl K 105and 106.Fl U 107flags are intended to be used for fine grain differentiation of incremental 108.Fx 109development and user visible changes. 110Note that when both of these two options are specified, regardless of their 111order, the kernel version would be printed first, followed by the user 112environment version. 113.Sh ENVIRONMENT 114An environment variable composed of the string 115.Ev UNAME_ 116followed by any flag to the 117.Nm 118utility (except for 119.Fl a ) 120will allow the corresponding data to be set to the contents 121of the environment variable. 122.Sh EXIT STATUS 123.Ex -std 124.Sh EXAMPLES 125The hardware platform 126.Pq Fl m 127can be different from the machine's processor architecture 128.Pq Fl p , 129e.g., on 64-bit PowerPC, 130.Fl m 131would return 132.Va powerpc 133and 134.Fl p 135would return 136.Va powerpc64 . 137.Sh SEE ALSO 138.Xr feature_present 3 , 139.Xr getosreldate 3 , 140.Xr sysctl 3 , 141.Xr uname 3 , 142.Xr sysctl 8 143.Sh STANDARDS 144The 145.Nm 146command is expected to conform to the 147.St -p1003.2 148specification. 149.Sh HISTORY 150The 151.Nm 152command appeared in PWB UNIX 1.0, however 153.Bx 4.4 154was the first Berkeley release with the 155.Nm 156command. 157.Pp 158The 159.Fl K 160and 161.Fl U 162extension flags appeared in 163.Fx 10.0 . 164The 165.Fl b 166extension flag appeared in 167.Fx 13.0 . 168