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Man Pages


Manual Reference Pages  -  UNAME (1)

NAME

uname - display information about the system

CONTENTS

Synopsis
Description
Environment
Exit Status
See Also
Standards
History

SYNOPSIS

uname [-aiKmnoprsUv]

DESCRIPTION

The uname 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.

The options are as follows:
-a Behave as though the options -m -, -n -, -r -, -s , and -v were specified.
-i Write the kernel ident to standard output.
-K Write the
.Fx version of the kernel.
-m Write the type of the current hardware platform to standard output.
-n Write the name of the system to standard output.
-o This is a synonym for the -s option, for compatibility with other systems.
-p Write the type of the machine processor architecture to standard output.
-r Write the current release level of the operating system to standard output.
-s Write the name of the operating system implementation to standard output.
-U Write the
.Fx version of the user environment.
-v Write the version level of this release of the operating system to standard output.

If the -a flag is specified, or multiple flags are specified, all output is written on a single line, separated by spaces.

The -K and -U flags are intended to be used for fine grain differentiation of incremental
.Fx development and user visible changes.

ENVIRONMENT

An environment variable composed of the string UNAME_ followed by any flag to the uname utility (except for -a ) will allow the corresponding data to be set to the contents of the environment variable.

EXIT STATUS


.Ex -std

SEE ALSO

feature_present(3), getosreldate(3), sysctl(3), uname(3), sysctl(8)

STANDARDS

The uname command is expected to conform to the -p1003.2 specification.

HISTORY

The uname command appeared in PWB UNIX.

The -K and -U extension flags appeared in
.Fx 10.0 .

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