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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 differ (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  out-
       put.  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() func-
       tion 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 log-
       name:
       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  Vari-
              ables  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
       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 produce 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,  getlo-
       gin()
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 original Standard can be  obtained  online
       at http://www.opengroup.org/unix/online.html .

IEEE/The Open Group                  2003                          LOGNAME(1P)