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UNAME(1P) POSIX Programmer's Manual UNAME(1P)
This manual page is part of the POSIX Programmer's Manual. The Linux
implementation of this interface may differ (consult the
corresponding Linux manual page for details of Linux behavior), or
the interface may not be implemented on Linux.
uname — return system name
uname [−amnrsv]
By default, the uname utility shall write the operating system name
to standard output. When options are specified, symbols representing
one or more system characteristics shall be written to the standard
output. The format and contents of the symbols are implementation-
defined. On systems conforming to the System Interfaces volume of
POSIX.1‐2008, the symbols written shall be those supported by the
uname() function as defined in the System Interfaces volume of
POSIX.1‐2008.
The uname utility shall conform to the Base Definitions volume of
POSIX.1‐2008, 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 implementation-
defined communications network.
−r Write the current release level of the operating system
implementation.
−s Write the name of the implementation of the operating
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.
None.
Not used.
None.
The following environment variables shall affect the execution of
uname:
LANG Provide a default value for the internationalization
variables that are unset or null. (See the Base Definitions
volume of POSIX.1‐2008, Section 8.2, Internationalization
Variables for the precedence of internationalization
variables used to determine the values of locale
categories.)
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 messages written to
standard error.
NLSPATH Determine the location of message catalogs for the
processing of LC_MESSAGES.
Default.
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 written; all such
symbols shall be written at the end of the line of output before the
<newline>.
If options are specified to select different combinations of the
symbols, only those symbols shall be written, in the order shown
above for the −a option. If a symbol is not selected for writing, its
corresponding trailing <blank> characters also shall not be written.
The standard error shall be used only for diagnostic messages.
None.
None.
The following exit values shall be returned:
0 The requested information was successfully written.
>0 An error occurred.
Default.
The following sections are informative.
Note that any of the symbols could include embedded <space>
characters, which may affect parsing algorithms if multiple options
are selected for output.
The node name is typically a name that the system uses to identify
itself for inter-system communication addressing.
The following command:
uname −sr
writes the operating system name and release level, separated by one
or more <blank> characters.
It was suggested that this utility cannot be used portably since the
format of the symbols is implementation-defined. The POSIX.1 working
group could not achieve consensus on defining these formats in the
underlying uname() function, and there was no expectation that this
volume of POSIX.1‐2008 would be any more successful. Some
applications may still find this historical utility of value. For
example, the symbols could be used for system log entries or for
comparison with operator or user input.
None.
The Base Definitions volume of POSIX.1‐2008, Chapter 8, Environment
Variables, Section 12.2, Utility Syntax Guidelines
The System Interfaces volume of POSIX.1‐2008, uname(3p)
Portions of this text are reprinted and reproduced in electronic form
from IEEE Std 1003.1, 2013 Edition, Standard for Information
Technology -- Portable Operating System Interface (POSIX), The Open
Group Base Specifications Issue 7, Copyright (C) 2013 by the
Institute of Electrical and Electronics Engineers, Inc and The Open
Group. (This is POSIX.1-2008 with the 2013 Technical Corrigendum 1
applied.) 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.unix.org/online.html .
Any typographical or formatting errors that appear in this page are
most likely to have been introduced during the conversion of the
source files to man page format. To report such errors, see
https://www.kernel.org/doc/man-pages/reporting_bugs.html .
IEEE/The Open Group 2013 UNAME(1P)
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