An untested example of a possible solution: 
open(FILE_A, "< file_a.txt") or die "Cannot open file_a: $!\n";
open(FILE_B, "< file_b.txt") or die "Cannot open file_b: $!\n";

while (1) {
    my $line_a = <FILE_A>;
    my $line_b = <FILE_B>;

    last if not defined $line_a or not defined $line_b;
    
    # Processing of $line_a and $line_b...
}
close(FILE_A);
close(FILE_B);

[download]

Arjen

In reply to Re: Using more than one filehandle by Aragorn
in thread Using more than one filehandle 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.