Query: perl::critic::policy::inputoutput::prohibitexplicitstdin
OS: debian
Section: 3pm
Format: Original Unix Latex Style Formatted with HTML and a Horizontal Scroll Bar
Perl::Critic::Policy::InputOutput::ProhibitExplicitStdinUser)Contributed Perl DocumenPerl::Critic::Policy::InputOutput::ProhibitExplicitStdin(3pm)NAMEPerl::Critic::Policy::InputOutput::ProhibitExplicitStdin - Use "<>" or "<ARGV>" or a prompting module instead of "<STDIN>".AFFILIATIONThis Policy is part of the core Perl::Critic distribution.DESCRIPTIONPerl 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.CONFIGURATIONThis Policy is not configurable except for the standard options.CAVEATSDue 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.CREDITSInitial development of this policy was supported by a grant from the Perl Foundation.AUTHORChris Dolan <cdolan@cpan.org>COPYRIGHTCopyright (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 v5.14.2 2012-06-07 Perl::Critic::Policy::InputOutput::ProhibitExplicitStdin(3pm)
Similar Topics in the Unix Linux Community |
---|
redirect STDIN |
Is the script correct ??? |
Using ARGV, acepting text from command line |
Perl Parsing Argument |
Perl: How to check if there is something being piped in |