Perl-opening a file then copying files Post: 302414817

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perl::critic::policy::inputoutput::prohibitbarewordfilehandles

Perl::Critic::Policy::InputOutput::ProhibitBarewordFileHUsereContributed Perl DocPerl::Critic::Policy::InputOutput::ProhibitBarewordFileHandles(3)

NAME

       Perl::Critic::Policy::InputOutput::ProhibitBarewordFileHandles - Write "open my $fh, q{<}, $filename;" instead of "open FH, q{<},
       $filename;".

AFFILIATION

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

DESCRIPTION

       Using bareword symbols to refer to file handles is particularly evil because they are global, and you have no idea if that symbol already
       points to some other file handle.  You can mitigate some of that risk by "local"izing the symbol first, but that's pretty ugly.	Since Perl
       5.6, you can use an undefined scalar variable as a lexical reference to an anonymous filehandle.  Alternatively, see the IO::Handle or
       IO::File or FileHandle modules for an object-oriented approach.

	   open FH, '<', $some_file;	       #not ok
	   open my $fh, '<', $some_file;       #ok
	   my $fh = IO::File->new($some_file); #ok

       There are three exceptions: STDIN, STDOUT and STDERR.  These three standard filehandles are always package variables.

CONFIGURATION

       This Policy is not configurable except for the standard options.

SEE ALSO

       IO::Handle

       IO::File

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.

perl v5.16.3							    2014-06-09	 Perl::Critic::Policy::InputOutput::ProhibitBarewordFileHandles(3)