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Linux 2.6 - man page for uname (linux section 1posix)

UNAME(P)			    POSIX Programmer's Manual				 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 specified, symbols representing one or more system characteristics  shall
       be  written to the standard output. The format and contents of the symbols are implementa-
       tion-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 out-
	      put.

       -n     Write the name of this node within an  implementation-defined  communications  net-
	      work.

       -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 implementa-
	      tion.

       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 internationalization variables that are unset or
	      null. (See the Base Definitions volume of IEEE Std 1003.1-2001, Section 8.2, Inter-
	      nationalization 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  interna-
	      tionalization 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  argu-
	      ments).

       LC_MESSAGES
	      Determine the locale that should be used to affect the format and contents of diag-
	      nostic messages 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 written; all such symbols shall be  writ-
       ten at the end of the line of output before the <newline>.

       If  options are specified to select different combinations of the symbols, only those sym-
       bols shall be written, 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 written.

       >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 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.

EXAMPLES
       The following command:

	      uname -sr

       writes the operating system name and release level, separated by one or more <blank>s.

RATIONALE
       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 defin-
       ing  these  formats  in the underlying uname() function, and there was no expectation 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 symbols could be used for
       system log entries or for comparison 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 Operating System
       Interface (POSIX), The Open Group Base Specifications Issue 6, Copyright (C) 2001-2003  by
       the  Institute  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 orig-
       inal Standard can be obtained online at http://www.opengroup.org/unix/online.html .

IEEE/The Open Group			       2003					 UNAME(P)


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