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LOGNAME(P)		   POSIX Programmer's Manual		    LOGNAME(P)

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(P)
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