xenial (1) true.1posix.gz

Provided by: manpages-posix_2013a-1_all bug

PROLOG
       This  manual  page  is part of the POSIX Programmer's Manual.  The Linux implementation of this interface
       may differ (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 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


       Portions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1, 2013 Edition,
       Standard  for  Information Technology -- 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 Standard 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 .