xenial (1) uname.1posix.gz

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PROLOG

       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.

NAME

       uname — return system name

SYNOPSIS

       uname [−amnrsv]

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 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.

OPTIONS

       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.

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 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.

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> characters 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>  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.

EXAMPLES

       The following command:

           uname −sr

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

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  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.

FUTURE DIRECTIONS

       None.

SEE ALSO

       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()

       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 .