171 lines
4.3 KiB
Groff
171 lines
4.3 KiB
Groff
.\" Copyright (c) 1993
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.\" The Regents of the University of California. All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\" 3. Neither the name of the University nor the names of its contributors
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.\" may be used to endorse or promote products derived from this software
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.\" without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" @(#)uname.1 8.3 (Berkeley) 4/8/94
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.\" $FreeBSD$
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.\"
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.Dd November 13, 2020
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.Dt UNAME 1
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.Os
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.Sh NAME
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.Nm uname
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.Nd display information about the system
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.Sh SYNOPSIS
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.Nm
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.Op Fl abiKmnoprsUv
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.Sh DESCRIPTION
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The
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.Nm
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command writes the name of the operating system implementation to
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standard output.
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When options are specified, strings representing one or more system
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characteristics are written to standard output.
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.Pp
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The options are as follows:
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.Bl -tag -width indent
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.It Fl a
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Behave as though the options
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.Fl m , n , r , s ,
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and
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.Fl v
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were specified.
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.It Fl b
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Write the kernel's linker-generated build-id to standard output.
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.It Fl i
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Write the kernel ident to standard output.
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.It Fl K
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Write the
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.Fx
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version of the kernel.
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.It Fl m
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Write the type of the current hardware platform to standard output.
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.Po Xr make 1
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uses it to set the
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.Va MACHINE
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variable.
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.Pc
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.It Fl n
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Write the name of the system to standard output.
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.It Fl o
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This is a synonym for the
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.Fl s
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option, for compatibility with other systems.
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.It Fl p
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Write the type of the machine processor architecture to standard output.
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.Po Xr make 1
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uses it to set the
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.Va MACHINE_ARCH
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variable.
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.Pc
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.It Fl r
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Write the current release level of the operating system
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to standard output.
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.It Fl s
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Write the name of the operating system implementation to standard output.
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.It Fl U
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Write the
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.Fx
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version of the user environment.
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.It Fl v
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Write the version level of this release of the operating system
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to standard output.
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.El
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.Pp
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If the
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.Fl a
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flag is specified, or multiple flags are specified, all
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output is written on a single line, separated by spaces.
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.Pp
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The
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.Fl K
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and
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.Fl U
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flags are intended to be used for fine grain differentiation of incremental
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.Fx
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development and user visible changes.
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Note that when both of these two options are specified, regardless of their
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order, the kernel version would be printed first, followed by the user
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environment version.
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.Sh ENVIRONMENT
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An environment variable composed of the string
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.Ev UNAME_
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followed by any flag to the
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.Nm
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utility (except for
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.Fl a )
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will allow the corresponding data to be set to the contents
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of the environment variable.
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See
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.Xr uname 3
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for more information.
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.Sh EXIT STATUS
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.Ex -std
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.Sh EXAMPLES
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The hardware platform
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.Pq Fl m
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can be different from the machine's processor architecture
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.Pq Fl p ,
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e.g., on 64-bit PowerPC,
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.Fl m
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would return
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.Va powerpc
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and
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.Fl p
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would return
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.Va powerpc64 .
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.Sh SEE ALSO
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.Xr feature_present 3 ,
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.Xr getosreldate 3 ,
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.Xr sysctl 3 ,
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.Xr uname 3 ,
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.Xr sysctl 8
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.Sh STANDARDS
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The
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.Nm
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command is expected to conform to the
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.St -p1003.2
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specification.
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.Sh HISTORY
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The
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.Nm
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command appeared in PWB UNIX 1.0, however
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.Bx 4.4
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was the first Berkeley release with the
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.Nm
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command.
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.Pp
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The
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.Fl K
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and
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.Fl U
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extension flags appeared in
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.Fx 10.0 .
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The
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.Fl b
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extension flag appeared in
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.Fx 13.0 .
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