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Full Discussion: System variables in Perl
Top Forums Shell Programming and Scripting System variables in Perl Post 302344722 by kodak on Monday 17th of August 2009 11:36:15 AM
Old 08-17-2009
The hash %ENV contains your current environment.

You can step through each one by doing:

#!/usr/bin/perl
foreach $key (sort keys %ENV) {
print "$key: $ENV{$key} \n";
}

Or access a single element by doing something like:

print "$ENV{'USER'}\n";

HTH
 

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LEARN ABOUT DEBIAN

perl::critic::policy::modules::requirenomatchvarswithuseenglish

Perl::Critic::Policy::Modules::RequireNoMatchVarsWithUseUseriContributed Perl Perl::Critic::Policy::Modules::RequireNoMatchVarsWithUseEnglish(3pm)

NAME

       Perl::Critic::Policy::Modules::RequireNoMatchVarsWithUseEnglish - "use English" must be passed a "-no_match_vars" argument.

AFFILIATION

       This Policy is part of the core Perl::Critic distribution.

DESCRIPTION

       Due to unfortunate history, if you use the English module but don't pass in a "-no_match_vars" argument, all regular expressions in the
       entire program, not merely the module in question, suffer a significant performance penalty, even if you only import a subset of the
       variables.

	   use English; 			     # not ok
	   use English '-no_match_vars';	     # ok
	   use English qw< $ERRNO -no_match_vars >;  # ok
	   use English qw($OS_ERROR);		     # not ok

       In the last example above, while the match variables aren't loaded into your namespace, they are still created in the "English" namespace
       and you still pay the cost.

CONFIGURATION

       This Policy is not configurable except for the standard options.

AUTHOR

       Elliot Shank "<perl@galumph.com>"

COPYRIGHT

       Copyright (c) 2008-2011 Elliot Shank.

       This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself.  The full text of this license
       can be found in the LICENSE file included with this module.

perl v5.14.2							    2012-06-07Perl::Critic::Policy::Modules::RequireNoMatchVarsWithUseEnglish(3pm)
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