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uname(P) uname(P)
NAME
uname - return system name
SYNOPSIS
uname [-snrvma]
DESCRIPTION
By default, the uname utility shall write the operating
system name to standard output. When options are speci-
fied, symbols representing one or more system character-
istics shall be written to the standard output. The for-
mat and contents of the symbols are implementation-
defined. On systems conforming to the System Interfaces
volume of IEEE Std 1003.1-2001, the symbols written
shall be those supported by the uname() function as
defined in the System Interfaces volume of
IEEE Std 1003.1-2001.
OPTIONS
The uname utility shall conform to the Base Definitions
volume of IEEE Std 1003.1-2001, Section 12.2, Utility
Syntax Guidelines.
The following options shall be supported:
-a Behave as though all of the options -mnrsv were
specified.
-m Write the name of the hardware type on which the
system is running to standard output.
-n Write the name of this node within an implementa-
tion-defined communications network.
-r Write the current release level of the operating
system implementation.
-s Write the name of the implementation of the oper-
ating system.
-v Write the current version level of this release
of the operating system implementation.
If no options are specified, the uname utility shall
write the operating system name, as if the -s option had
been specified.
OPERANDS
None.
STDIN
Not used.
INPUT FILES
None.
ENVIRONMENT VARIABLES
The following environment variables shall affect the
execution of uname:
LANG Provide a default value for the internationaliza-
tion variables that are unset or null. (See the
Base Definitions volume of IEEE Std 1003.1-2001,
Section 8.2, Internationalization Variables for
the precedence of internationalization variables
used to determine the values of locale cate-
gories.)
LC_ALL If set to a non-empty string value, override the
values of all the other internationalization
variables.
LC_CTYPE
Determine the locale for the interpretation of
sequences of bytes of text data as characters
(for example, single-byte as opposed to multi-
byte characters in arguments).
LC_MESSAGES
Determine the locale that should be used to
affect the format and contents of diagnostic mes-
sages written to standard error.
NLSPATH
Determine the location of message catalogs for
the processing of LC_MESSAGES .
ASYNCHRONOUS EVENTS
Default.
STDOUT
By default, the output shall be a single line of the
following form:
"%s\n", <sysname>
If the -a option is specified, the output shall be a
single line of the following form:
"%s %s %s %s %s\n", <sysname>, <nodename>, <release>,
<version>, <machine>
Additional implementation-defined symbols may be writ-
ten; all such symbols shall be written at the end of the
line of output before the <newline>.
If options are specified to select different combina-
tions of the symbols, only those symbols shall be writ-
ten, in the order shown above for the -a option. If a
symbol is not selected for writing, its corresponding
trailing <blank>s also shall not be written.
STDERR
The standard error shall be used only for diagnostic
messages.
OUTPUT FILES
None.
EXTENDED DESCRIPTION
None.
EXIT STATUS
The following exit values shall be returned:
0 The requested information was successfully writ-
ten.
>0 An error occurred.
CONSEQUENCES OF ERRORS
Default.
The following sections are informative.
APPLICATION USAGE
Note that any of the symbols could include embedded
<space>s, which may affect parsing algorithms if multi-
ple options are selected for output.
The node name is typically a name that the system uses
to identify itself for inter-system communication
addressing.
EXAMPLES
The following command:
uname -sr
writes the operating system name and release level, sep-
arated by one or more <blank>s.
RATIONALE
It was suggested that this utility cannot be used
portably since the format of the symbols is implementa-
tion-defined. The POSIX.1 working group could not
achieve consensus on defining these formats in the
underlying uname() function, and there was no expecta-
tion that this volume of IEEE Std 1003.1-2001 would be
any more successful. Some applications may still find
this historical utility of value. For example, the sym-
bols could be used for system log entries or for compar-
ison with operator or user input.
FUTURE DIRECTIONS
None.
SEE ALSO
The System Interfaces volume of IEEE Std 1003.1-2001,
uname()
COPYRIGHT
Portions of this text are reprinted and reproduced in
electronic form from IEEE Std 1003.1, 2003 Edition,
Standard for Information Technology -- Portable Operat-
ing System Interface (POSIX), The Open Group Base Speci-
fications Issue 6, Copyright (C) 2001-2003 by the Insti-
tute of Electrical and Electronics Engineers, Inc and
The Open Group. In the event of any discrepancy between
this version and the original IEEE and The Open Group
Standard, the original IEEE and The Open Group Standard
is the referee document. The original Standard can be
obtained online at http://www.open-
group.org/unix/online.html .
POSIX 2003 uname(P)
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