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  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, 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
       original Standard can be obtained online at http://www.opengroup.org/unix/online.html .

IEEE/The Open Group                                   2003                                            LOGNAME(P)