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Shell Programming and Scripting
grep command with combined variables in Ksh
Post 99802 by blowtorch on Tuesday 21st of February 2006 04:29:54 PM
02-21-2006
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LEARN ABOUT CENTOS
perl::critic::policy::valuesandexpressions::prohibitinterpolatio
Perl::Critic::Policy::ValuesAndExpressions::ProhibitInteUseraContribPerl::Critic::Policy::ValuesAndExpressions::ProhibitInterpolationOfLiterals(3) NAME
Perl::Critic::Policy::ValuesAndExpressions::ProhibitInterpolationOfLiterals - Always use single quotes for literal strings. AFFILIATION
This Policy is part of the core Perl::Critic distribution. DESCRIPTION
Don't use double-quotes or "qq//" if your string doesn't require interpolation. This saves the interpreter a bit of work and it lets the reader know that you really did intend the string to be literal. print "foobar"; #not ok print 'foobar'; #ok print qq/foobar/; #not ok print q/foobar/; #ok print "$foobar"; #ok print "foobar "; #ok print qq/$foobar/; #ok print qq/foobar /; #ok print qq{$foobar}; #preferred print qq{foobar }; #preferred Use of double-quotes might be reasonable if the string contains single quote (') characters: print "it's me"; # ok, if configuration flag set CONFIGURATION
The types of quoting styles to exempt from this policy can be configured via the "allow" option. This must be a whitespace-delimited combination of some or all of the following styles: "qq{}", "qq()", "qq[]", and "qq//". This is useful because some folks have configured their editor to apply special syntax highlighting within certain styles of quotes. For example, you can tweak "vim" to use SQL highlighting for everything that appears within "qq{}" or "qq[]" quotes. But if those strings are literal, Perl::Critic will complain. To prevent this, put the following in your .perlcriticrc file: [ValuesAndExpressions::ProhibitInterpolationOfLiterals] allow = qq{} qq[] The flag "allow_if_string_contains_single_quote" permits double-quoted strings if the string contains a single quote (') character. It defaults to off; to turn it on put the following in your .perlcriticrc file: [ValuesAndExpressions::ProhibitInterpolationOfLiterals] allow_if_string_contains_single_quote = 1 SEE ALSO
Perl::Critic::Policy::ValuesAndExpressions::RequireInterpolationOfMetachars AUTHOR
Jeffrey Ryan Thalhammer <jeff@imaginative-software.com> COPYRIGHT
Copyright (c) 2005-2011 Imaginative Software Systems. All rights reserved. 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 v5.16.3 Perl::Critic::Policy::ValuesAndExpressions::ProhibitInterpolationOfLiterals(3)