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TRUE(1P)                   POSIX Programmer's Manual                  TRUE(1P)



PROLOG
       This manual page is part of the POSIX Programmer's Manual.  The Linux implementation of this interface may dif-
       fer (consult the corresponding Linux manual page for details of Linux behavior), or the interface  may  not  be
       implemented on Linux.

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, Stan-
       dard  for Information Technology -- Portable Operating System Interface (POSIX), The Open Group Base Specifica-
       tions 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 Stan-
       dard, 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                             TRUE(1P)