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Full Discussion: Displaying the first field if the second field matches the pattern using Perl
Top Forums Shell Programming and Scripting Displaying the first field if the second field matches the pattern using Perl Post 302726549 by royalibrahim on Sunday 4th of November 2012 08:20:58 PM
Old 11-04-2012
Displaying the first field if the second field matches the pattern using Perl
Hi,

I am trying with the below Perl command to print the first field when the second field matches the given pattern:
Code:
perl -lane 'open F, "< myfile"; for $i (<F>) {chomp $i; if ($F[1] =~ /patt$/) {my $f = (split(" ", $i))[0]; print "$f";}} close F' dummy_file

I know I can achieve the same with the following thread: https://www.unix.com/shell-programmin...s-pattern.html. But still I am curious why this code is not returning any expected result and how to correct it. Any help please.
 

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LEARN ABOUT DEBIAN

perl::critic::policy::builtinfunctions::requireblockmap

Perl::Critic::Policy::BuiltinFunctions::RequireBlockMap(User Contributed Perl DocumentPerl::Critic::Policy::BuiltinFunctions::RequireBlockMap(3pm)

NAME

       Perl::Critic::Policy::BuiltinFunctions::RequireBlockMap - Write "map { $_ =~ /$pattern/ } @list" instead of "map /$pattern/, @list".

AFFILIATION

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

DESCRIPTION

       The expression forms of "grep" and "map" are awkward and hard to read.  Use the block forms instead.

	   @matches = grep   /pattern/,   @list;	#not ok
	   @matches = grep { /pattern/ }  @list;	#ok

	   @mapped = map   transform($_),   @list;	#not ok
	   @mapped = map { transform($_) }  @list;	#ok

CONFIGURATION

       This Policy is not configurable except for the standard options.

SEE ALSO

       Perl::Critic::Policy::BuiltinFunctions::ProhibitStringyEval

       Perl::Critic::Policy::BuiltinFunctions::RequireBlockGrep

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 v5.14.2							    2012-06-07	      Perl::Critic::Policy::BuiltinFunctions::RequireBlockMap(3pm)
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