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Top Forums Shell Programming and Scripting Find file size difference in two files using awk Post 302498599 by bartus11 on Tuesday 22nd of February 2011 02:39:51 AM
Old 02-22-2011
Quote:
Originally Posted by royalibrahim
Thank you bartus, it worked perfectly. But, I cannot decode the logic. Could you please explain this to me?

Few doubts in this:
NR!=FNR --> this is needed because I told that counting of the lines may not be same in both the files? Or this is an indicator to parse the second file? If that so, this explicit indication is really needed to make awk to parse the 2nd file? Please clarify me.
You second guess is correct. NR==FNR means parsing 1st file, and NR!=FNR - second. It can be written differently thought:
Code:
'NR==FNR{a[$2]=$1;next}{a[$2]...

 

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File::Find::Rule::Procedural(3) 			User Contributed Perl Documentation			   File::Find::Rule::Procedural(3)

NAME
File::Find::Rule::Procedural - File::Find::Rule's procedural interface SYNOPSIS
use File::Find::Rule; # find all .pm files, procedurally my @files = find(file => name => '*.pm', in => @INC); DESCRIPTION
In addition to the regular object-oriented interface, File::Find::Rule provides two subroutines for you to use. "find( @clauses )" "rule( @clauses )" "find" and "rule" can be used to invoke any methods available to the OO version. "rule" is a synonym for "find" Passing more than one value to a clause is done with an anonymous array: my $finder = find( name => [ '*.mp3', '*.ogg' ] ); "find" and "rule" both return a File::Find::Rule instance, unless one of the arguments is "in", in which case it returns a list of things that match the rule. my @files = find( name => [ '*.mp3', '*.ogg' ], in => $ENV{HOME} ); Please note that "in" will be the last clause evaluated, and so this code will search for mp3s regardless of size. my @files = find( name => '*.mp3', in => $ENV{HOME}, size => '<2k' ); ^ | Clause processing stopped here ------/ It is also possible to invert a single rule by prefixing it with "!" like so: # large files that aren't videos my @files = find( file => '!name' => [ '*.avi', '*.mov' ], size => '>20M', in => $ENV{HOME} ); AUTHOR
Richard Clamp <richardc@unixbeard.net> COPYRIGHT
Copyright (C) 2003 Richard Clamp. All Rights Reserved. This module is free software; you can redistribute it and/or modify it under the same terms as Perl itself. SEE ALSO
File::Find::Rule perl v5.16.3 2011-09-19 File::Find::Rule::Procedural(3)
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