posix man page for true

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 differ (consult the correspond-
       ing 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  effi-
       cient than true.

EXAMPLES
       This command is executed forever:

	   while true
	   do
	       command
	   done

RATIONALE
       The true utility has been retained in this volume of POSIX.1-2008, 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
       Section 2.9, Shell Commands, false

COPYRIGHT
       Portions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1, 2013 Edition, Standard for Information Technol-
       ogy  --	Portable  Operating  System  Interface (POSIX), The Open Group Base Specifications Issue 7, Copyright (C) 2013 by the Institute of
       Electrical and Electronics Engineers, Inc and The Open Group.  (This is POSIX.1-2008 with the 2013 Technical Corrigendum 1 applied.) 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 Stan-
       dard is the referee document. The original Standard can be obtained online at http://www.unix.org/online.html .

       Any typographical or formatting errors that appear in this page are most likely to have been introduced during the conversion of the source
       files to man page format. To report such errors, see https://www.kernel.org/doc/man-pages/reporting_bugs.html .

IEEE
/The Open Group						       2013								  TRUE(1P)