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true(P) true(P)
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,
Standard for Information Technology -- Portable Operat-
ing System Interface (POSIX), The Open Group Base Speci-
fications Issue 6, Copyright (C) 2001-2003 by the Insti-
tute 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
Standard, the original IEEE and The Open Group Standard
is the referee document. The original Standard can be
obtained online at http://www.open-
group.org/unix/online.html .
POSIX 2003 true(P)
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