Perl::Critic::Policy::IUPnseperurlt:OC:uoCtnrptiurttii:bc:u:Pt:rePodohliPibecirytl:T:wDIoonAcpruugmtOeOpnuettnap(tu3it)o:n:ProhibitTwoArgOpen(3)



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

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

DDEESSCCRRIIPPTTIIOONN
       The three-argument form of "open" (introduced in Perl 5.6) prevents
       subtle bugs that occur when the filename starts with funny characters
       like '>' or '<'.  The IO::File module provides a nice object-oriented
       interface to filehandles, which I think is more elegant anyway.

         open( $fh, '>output.txt' );          # not ok
         open( $fh, q{>}, 'output.txt' );     # ok

         use IO::File;
         my $fh = IO::File->new( 'output.txt', q{>} ); # even better!

       It's also more explicitly clear to define the input mode of the file,
       as in the difference between these two:

         open( $fh, 'foo.txt' );       # BAD: Reader must think what default mode is
         open( $fh, '<', 'foo.txt' );  # GOOD: Reader can see open mode

       This policy will not complain if the file explicitly states that it is
       compatible with a version of perl prior to 5.6 via an include
       statement, e.g. by having "require 5.005" in it.

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

NNOOTTEESS
       There are two cases in which you are forced to use the two-argument
       form of open. When re-opening STDIN, STDOUT, or STDERR, and when doing
       a safe pipe open, as described in perlipc.

SSEEEE AALLSSOO
       IO::Handle

       IO::File

AAUUTTHHOORR
       Jeffrey Ryan Thalhammer <jeff@imaginative-software.com>

CCOOPPYYRRIIGGHHTT
       Copyright (c) 2005-2010 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 v5.12.2          Perl::Critic2:0:1P1o-l0i8c-y1:4:InputOutput::ProhibitTwoArgOpen(3)
