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Full Discussion: How to Compare Null values??
Top Forums UNIX for Advanced & Expert Users How to Compare Null values?? Post 302317538 by colemar on Tuesday 19th of May 2009 09:13:29 AM
Old 05-19-2009
If you are aking about shell variables...

Code:
[[ "$a" = "$b" ]] && echo equal || echo not equal

 

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Cache::Null(3pm)					User Contributed Perl Documentation					  Cache::Null(3pm)

NAME
Cache::Null - Null implementation of the Cache interface SYNOPSIS
use Cache::Null; my $cache = Cache::Null->new(); See Cache for the usage synopsis. DESCRIPTION
The Cache::Null class implements the Cache interface, but does not actually persist data. This is useful when developing and debugging a system and you wish to easily turn off caching. As a result, all calls return results indicating that there is no data stored. CONSTRUCTOR
my $cache = Cache::Null->new( %options ) The constructor takes cache properties as named arguments, for example: my $cache = Cache::Null->new( default_expires => '600 sec' ); See 'PROPERTIES' below and in the Cache documentation for a list of all available properties that can be set. However it should be noted that all the existing properties, such as default_expires, have no effect in a Null cache. METHODS
See 'Cache' for the API documentation. SEE ALSO
Cache AUTHOR
Chris Leishman <chris@leishman.org> Based on work by DeWitt Clinton <dewitt@unto.net> COPYRIGHT
Copyright (C) 2003-2006 Chris Leishman. All Rights Reserved. This module is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, either expressed or implied. This program is free software; you can redistribute or modify it under the same terms as Perl itself. $Id: Null.pm,v 1.4 2006/01/31 15:23:58 caleishm Exp $ perl v5.12.4 2011-08-05 Cache::Null(3pm)
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