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UNAME(1P)                  POSIX Programmer's Manual                 UNAME(1P)



PROLOG
       This manual page is part of the POSIX Programmer's Manual.  The Linux implementation of this interface may dif-
       fer (consult the corresponding Linux manual page for details of Linux behavior), or the interface  may  not  be
       implemented on Linux.

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 characteristics 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 vol-
       ume 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 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.

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, Internationalization Variables for  the  prece-
              dence 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  exam-
              ple, 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 writ-
              ten 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 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>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 defining  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 suc-
       cessful. 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, Stan-
       dard for Information Technology -- Portable Operating System Interface (POSIX), The Open Group Base  Specifica-
       tions  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 Stan-
       dard,  the  original  IEEE  and  The  Open Group Standard is the referee document. The original Standard can be
       obtained online at http://www.opengroup.org/unix/online.html .



IEEE/The Open Group                  2003                            UNAME(1P)