true(P)                                                 true(P)





NAME
       true - return true value

SYNOPSIS
       true

DESCRIPTION
       The true utility shall return with exit code zero.

OPTIONS
       None.

OPERANDS
       None.

STDIN
       Not used.

INPUT FILES
       None.

ENVIRONMENT VARIABLES
       None.

ASYNCHRONOUS EVENTS
       Default.

STDOUT
       Not used.

STDERR
       Not used.

OUTPUT FILES
       None.

EXTENDED DESCRIPTION
       None.

EXIT STATUS
       Zero.

CONSEQUENCES OF ERRORS
       None.

       The following sections are informative.

APPLICATION USAGE
       This  utility  is  typically  used  in shell scripts, as
       shown in the  EXAMPLES  section.  The  special  built-in
       utility : is sometimes more efficient than true.

EXAMPLES
       This command is executed forever:


              while true
              do
                  command
              done

RATIONALE
       The  true  utility  has  been retained in this volume of
       IEEE Std 1003.1-2001,  even  though  the  shell  special
       built-in  : provides similar functionality, because true
       is widely used in historical scripts and is less cryptic
       to novice script readers.

FUTURE DIRECTIONS
       None.

SEE ALSO
       false , Shell Commands

COPYRIGHT
       Portions  of  this  text are reprinted and reproduced in
       electronic form from  IEEE  Std  1003.1,  2003  Edition,
       Standard  for Information Technology -- Portable Operat-
       ing System Interface (POSIX), The Open Group Base Speci-
       fications Issue 6, Copyright (C) 2001-2003 by the Insti-
       tute 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.open-
       group.org/unix/online.html .



POSIX                         2003                      true(P)