freebsd-dev/usr.bin/uname/uname.1
Alexey Dokuchaev ab0dffafb7 - Add a simple example to uname(1) manual page to show how the hardware
platform (returned by -m) can be different from the machine's processor
  architecture (-p)
- Document that make(1) sets universal MACHINE and MACHINE_ARCH variables
  based on these values

Reviewed by:		imp, manpages (bjk)
Approved by:		bjk, imp (implied)
Differential Revision:	https://reviews.freebsd.org/D10489
2017-05-31 03:44:31 +00:00

155 lines
3.9 KiB
Groff

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.\" @(#)uname.1 8.3 (Berkeley) 4/8/94
.\" $FreeBSD$
.\"
.Dd May 31, 2017
.Dt UNAME 1
.Os
.Sh NAME
.Nm uname
.Nd display information about the system
.Sh SYNOPSIS
.Nm
.Op Fl aiKmnoprsUv
.Sh DESCRIPTION
The
.Nm
command writes the name of the operating system implementation to
standard output.
When options are specified, strings representing one or more system
characteristics are written to standard output.
.Pp
The options are as follows:
.Bl -tag -width indent
.It Fl a
Behave as though the options
.Fl m , n , r , s ,
and
.Fl v
were specified.
.It Fl i
Write the kernel ident to standard output.
.It Fl K
Write the
.Fx
version of the kernel.
.It Fl m
Write the type of the current hardware platform to standard output.
.Po Xr make 1
uses it to set the
.Va MACHINE
variable.
.Pc
.It Fl n
Write the name of the system to standard output.
.It Fl o
This is a synonym for the
.Fl s
option, for compatibility with other systems.
.It Fl p
Write the type of the machine processor architecture to standard output.
.Po Xr make 1
uses it to set the
.Va MACHINE_ARCH
variable.
.Pc
.It Fl r
Write the current release level of the operating system
to standard output.
.It Fl s
Write the name of the operating system implementation to standard output.
.It Fl U
Write the
.Fx
version of the user environment.
.It Fl v
Write the version level of this release of the operating system
to standard output.
.El
.Pp
If the
.Fl a
flag is specified, or multiple flags are specified, all
output is written on a single line, separated by spaces.
.Pp
The
.Fl K
and
.Fl U
flags are intended to be used for fine grain differentiation of incremental
.Fx
development and user visible changes.
.Sh ENVIRONMENT
An environment variable composed of the string
.Ev UNAME_
followed by any flag to the
.Nm
utility (except for
.Fl a )
will allow the corresponding data to be set to the contents
of the environment variable.
.Sh EXIT STATUS
.Ex -std
.Sh EXAMPLES
The hardware platform
.Pq Fl m
can be different from the machine's processor architecture
.Pq Fl p ,
e.g., on 64-bit PowerPC,
.Fl m
would return
.Va powerpc
and
.Fl p
would return
.Va powerpc64 .
.Sh SEE ALSO
.Xr feature_present 3 ,
.Xr getosreldate 3 ,
.Xr sysctl 3 ,
.Xr uname 3 ,
.Xr sysctl 8
.Sh STANDARDS
The
.Nm
command is expected to conform to the
.St -p1003.2
specification.
.Sh HISTORY
The
.Nm
command appeared in PWB UNIX.
.Pp
The
.Fl K
and
.Fl U
extension flags appeared in
.Fx 10.0 .