How to process multiple input files?

rnaeye has asked for the wisdom of the Perl Monks concerning the following question:

Hi!

Script below inserts a line above SECOND

tag in the text file. This script works fine when I have single input file. I would like to process hundreds of files at once. I have tried to put the script within a foreach loop, but it did not work. I was wondering if anyone could help.

Thank you.

My script:

#!/usr/bin/perl
use strict;
use warnings;

$^I = ".bak"; 
undef $/;

my $count = 0;
my $line = <>;

        $line =~ s    {
                            (<\/div>)
                     }    {
                    if (++$count == 2){
                            "\t<?php include(\$_SERVER['DOCUMENT_ROOT'
+].\"\/includes\/footer.php\"); ?>\n\n".$1;
                     } else {
                            $1;
                     }
                        }gex;
        print $line;
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Sample input file:

 <html lang="en">
<body>
        <!-- a lot of text here -->
<div id="masthead" >
        <!-- a lot of text here -->
</div> 
<!-- ###############################################  -->
<div id="wrapper" >
        <!--a lot of text here-->
</div>

</body>
</html>
[download]