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LOGNAME(1P)                POSIX Programmer's Manual               LOGNAME(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
       logname - return the user's login name

SYNOPSIS
       logname

DESCRIPTION
       The  logname  utility  shall write the user's login name to standard output. The login name shall be the string
       that  would  be  returned  by  the  getlogin()  function  defined  in   the   System   Interfaces   volume   of
       IEEE Std 1003.1-2001.  Under the conditions where the getlogin() function would fail, the logname utility shall
       write a diagnostic message to standard error and exit with a non-zero exit status.

OPTIONS
       None.

OPERANDS
       None.

STDIN
       Not used.

INPUT FILES
       None.

ENVIRONMENT VARIABLES
       The following environment variables shall affect the execution of logname:

       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
       The logname utility output shall be a single line consisting of the user's login name:


              "%s\n", <login name>

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     Successful completion.

       >0     An error occurred.


CONSEQUENCES OF ERRORS
       Default.

       The following sections are informative.

APPLICATION USAGE
       The  logname utility explicitly ignores the LOGNAME environment variable because environment changes could pro-
       duce erroneous results.

EXAMPLES
       None.

RATIONALE
       The passwd file is not listed as required because the implementation may have  other  means  of  mapping  login
       names.

FUTURE DIRECTIONS
       None.

SEE ALSO
       id, who, the System Interfaces volume of IEEE Std 1003.1-2001, getlogin()

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                          LOGNAME(1P)