PROLOG | NAME | SYNOPSIS | DESCRIPTION | OPTIONS | OPERANDS | STDIN | INPUT FILES | ENVIRONMENT VARIABLES | ASYNCHRONOUS EVENTS | STDOUT | STDERR | OUTPUT FILES | EXTENDED DESCRIPTION | EXIT STATUS | CONSEQUENCES OF ERRORS | APPLICATION USAGE | EXAMPLES | RATIONALE | FUTURE DIRECTIONS | SEE ALSO | COPYRIGHT

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

PROLOG         top

       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         top

       true — return true value

SYNOPSIS         top

       true

DESCRIPTION         top

       The true utility shall return with exit code zero.

OPTIONS         top

       None.

OPERANDS         top

       None.

STDIN         top

       Not used.

INPUT FILES         top

       None.

ENVIRONMENT VARIABLES         top

       None.

ASYNCHRONOUS EVENTS         top

       Default.

STDOUT         top

       Not used.

STDERR         top

       Not used.

OUTPUT FILES         top

       None.

EXTENDED DESCRIPTION         top

       None.

EXIT STATUS         top

       Zero.

CONSEQUENCES OF ERRORS         top

       None.

       The following sections are informative.

APPLICATION USAGE         top

       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         top

       This command is executed forever:

           while true
           do
               command
           done

RATIONALE         top

       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         top

       None.

SEE ALSO         top

       Section 2.9, Shell Commands, false(1p)

COPYRIGHT         top

       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 .

IEEE/The Open Group                 2013                            TRUE(1P)

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