02-15-2020
You need to use double quotes, rather than single ones in this case. Shell variables inside single quotes do not get expanded.
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LEARN ABOUT CENTOS
perl::critic::policy::valuesandexpressions::requireinterpolation
Perl::Critic::Policy::ValuesAndExpressions::RequireInterUsertContribPerl::Critic::Policy::ValuesAndExpressions::RequireInterpolationOfMetachars(3)
NAME
Perl::Critic::Policy::ValuesAndExpressions::RequireInterpolationOfMetachars - Warns that you might have used single quotes when you really
wanted double-quotes.
AFFILIATION
This Policy is part of the core Perl::Critic distribution.
DESCRIPTION
This policy warns you if you use single-quotes or "q//" with a string that has unescaped metacharacters that may need interpolation. Its
hard to know for sure if a string really should be interpolated without looking into the symbol table. This policy just makes an educated
guess by looking for metacharacters and sigils which usually indicate that the string should be interpolated.
Exceptions
o Variable names to "use vars":
use vars '$x'; # ok
use vars ('$y', '$z'); # ok
use vars qw< $a $b >; # ok
o Things that look like e-mail addresses:
print 'john@foo.com'; # ok
$address = 'suzy.bar@baz.net'; # ok
CONFIGURATION
The "rcs_keywords" option allows you to stop this policy from complaining about things that look like RCS variables, for example, in
deriving values for $VERSION variables.
For example, if you've got code like
our ($VERSION) = (q<$Revision: 4126 $> =~ m/(d+)/mx);
You can specify
[ValuesAndExpressions::RequireInterpolationOfMetachars]
rcs_keywords = Revision
in your .perlcriticrc to provide an exemption.
NOTES
Perl's own "warnings" pragma also warns you about this.
SEE ALSO
Perl::Critic::Policy::ValuesAndExpressions::ProhibitInterpolationOfLiterals
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::RequireInterpolationOfMetachars(3)