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Shell Programming and Scripting
Infinite while loop
Post 302370097 by proactiveaditya on Tuesday 10th of November 2009 11:01:00 AM
11-10-2009
Code:
"while false" - this would simply take you to the end of the while loop. I haven't seen this being used. Does it serve any purpose ??
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LEARN ABOUT CENTOS
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 IEEE Std 1003.1-2001, even though the shell special built-in : provides similar func- tionality, 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 Technol- ogy -- Portable Operating System Interface (POSIX), The Open Group Base Specifications Issue 6, Copyright (C) 2001-2003 by the Institute 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.opengroup.org/unix/online.html . IEEE
/The Open Group 2003 TRUE(1P)