One file contains values like 2000/01/03/aaa/xyz.xml 2002/04/01/bbb/abc.xml Second file contains 2000/01/03/xyz How to read the two files simultaneously and print the line if it is not present in file2 by spliting 4th field and .xml. 
#!/usr/bin/perl

$data_file="/tmp/input_ext_id.txt";
open(DAT, $data_file) || die("Could not open file!");
@datas=<DAT>;

foreach $data(@datas){
$data_orig=$data;
@data=split("/",$data);
$data[4] =~ s/\.xml//ig;
chomp($data_orig);
push(@finalarr,"$data_orig#$data[0]/$data[1]/$data[2]/$data[4]");
push(@finalarr, "$data[0]/$data[1]/$data[2]/$data[4]");
}
@sorted_list = sort(@finalarr);

[download]
redirected to a files. Then I am taking the difference of two files(first file after removing the 4th field and .xml) The difference of the lines is passed as <FILE2>. 
@datas=<FILE2>;

while ($line = <FILE1>) {
$position=rindex($line,"#")+1;
$lines = substr($line,$position);

#print $lines;

$lines =~ s/^\s//gi;


if ( grep( /$lines/,@datas) ) {
   print "$line";
}

[download]
When the files contains the line of 230K, it takes too long time and prints out the message "OUT of memory" The output should print 
2002/04/01/bbb/abc.xml

[download]

In reply to Read the two files by Anonymous Monk

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post, it's "PerlMonks-approved HTML":


  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.