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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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Parser::Style::Stream(3)				User Contributed Perl Documentation				  Parser::Style::Stream(3)

NAME
XML::Parser::Style::Stream - Stream style for XML::Parser SYNOPSIS
use XML::Parser; my $p = XML::Parser->new(Style => 'Stream', Pkg => 'MySubs'); $p->parsefile('foo.xml'); { package MySubs; sub StartTag { my ($e, $name) = @_; # do something with start tags } sub EndTag { my ($e, $name) = @_; # do something with end tags } sub Characters { my ($e, $data) = @_; # do something with text nodes } } DESCRIPTION
This style uses the Pkg option to find subs in a given package to call for each event. If none of the subs that this style looks for is there, then the effect of parsing with this style is to print a canonical copy of the document without comments or declarations. All the subs receive as their 1st parameter the Expat instance for the document they're parsing. It looks for the following routines: * StartDocument Called at the start of the parse . * StartTag Called for every start tag with a second parameter of the element type. The $_ variable will contain a copy of the tag and the %_ vari- able will contain attribute values supplied for that element. * EndTag Called for every end tag with a second parameter of the element type. The $_ variable will contain a copy of the end tag. * Text Called just before start or end tags with accumulated non-markup text in the $_ variable. * PI Called for processing instructions. The $_ variable will contain a copy of the PI and the target and data are sent as 2nd and 3rd parameters respectively. * EndDocument Called at conclusion of the parse. perl v5.8.4 2003-08-18 Parser::Style::Stream(3)
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