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Perl::Critic::Policy::InputOutpUserPCoPerl::Critic::Policy::InputOutput::ProhibitExplicitStdin(3)

NAME
       Perl::Critic::Policy::InputOutput::ProhibitExplicitStdin - Use "<>" or "<ARGV>" or a
       prompting module instead of "<STDIN>".

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

DESCRIPTION
       Perl has a useful magic filehandle called *ARGV that checks the command line and if there
       are any arguments, opens and reads those as files.  If there are no arguments, *ARGV
       behaves like *STDIN instead.  This behavior is almost always what you want if you want to
       create a program that reads from "STDIN".  This is often written in one of the following
       two equivalent forms:

	 while (<ARGV>) {
	   # ... do something with each input line ...
	 }
	 # or, equivalently:
	 while (<>) {
	   # ... do something with each input line ...
	 }

       If you want to prompt for user input, try special purpose modules like IO::Prompt.

CONFIGURATION
       This Policy is not configurable except for the standard options.

CAVEATS
       Due to a bug in the current version of PPI (v1.119_03) and earlier, the readline operator
       is often misinterpreted as less-than and greater-than operators after a comma.  Therefore,
       this policy misses important cases like

	 my $content = join '', <STDIN>;

       because it interprets that line as the nonsensical statement:

	 my $content = join '', < STDIN >;

       When that PPI bug is fixed, this policy should start catching those violations
       automatically.

CREDITS
       Initial development of this policy was supported by a grant from the Perl Foundation.

AUTHOR
       Chris Dolan <cdolan@cpan.org>

COPYRIGHT
       Copyright (c) 2007-2011 Chris Dolan.  Many 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::InputOutput::ProhibitExplicitStdin(3)
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