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Linux 2.6 - man page for logname (linux section 1posix)

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 output. The login name
       shall be the string that would be returned by the getlogin() function defined in the  Sys-
       tem  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, Inter-
	      nationalization 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  interna-
	      tionalization 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  argu-
	      ments).

       LC_MESSAGES
	      Determine the locale that should be used to affect the format and contents of diag-
	      nostic 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  environ-
       ment 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, getlogin()

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 orig-
       inal Standard can be obtained online at http://www.opengroup.org/unix/online.html .

IEEE/The Open Group			       2003				       LOGNAME(P)


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