true(1p) [posix man page]

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)

Check Out this Related Man Page

GETHOSTID(3P)						     POSIX Programmer's Manual						     GETHOSTID(3P)

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

       gethostid -- get an identifier for the current host

SYNOPSIS

       #include <unistd.h>

       long gethostid(void);

DESCRIPTION

       The gethostid() function shall retrieve a 32-bit identifier for the current host.

RETURN VALUE

       Upon successful completion, gethostid() shall return an identifier for the current host.

ERRORS

       No errors are defined.

       The following sections are informative.

EXAMPLES

       None.

APPLICATION USAGE

       This volume of POSIX.1-2008 does not define the domain in which the return value is unique.

RATIONALE

       None.

FUTURE DIRECTIONS

       None.

SEE ALSO

       initstate()

       The Base Definitions volume of POSIX.1-2008, <unistd.h>

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							     GETHOSTID(3P)

Linux and UNIX Man Pages

true(1p) [posix man page]

Check Out this Related Man Page