For starters, strictures and warnings.. Also, you are opening the files for writing, but using them for reading. 

open my $fh1, "<", $file1 or die "Cannot open file $file1: $!";
open my $fh1, "<", $file2 or die "Cannot open file $file2: $!";

[download]

Then, with while ( <F1>, <F2> ), you'd be reading a line from each file, not assinging it to anything, and entering the loop; $_ is only set while using while (<$file>). (I think.)

Really, that's quite a bad post you have there. Still, I've never tried something like this, so have a freebie from another newbie (and please try to ignore the awful variable names..): 

use strict;
use warnings;
use 5.010;
use autodie;

open my $fh1, '<', 'file1';
open my $fh2, '<', 'file2';

while (my $test1 = <$fh1>, my $test2 = <$fh2>) {
    chomp($test1 //= '');
    chomp($test2 //= '');
    say "$test1, $test2";
}

[download]

In reply to Re: Reading two text files parallelly... by Hugmeir
in thread Reading two text files parallelly... by biswanath_c

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.