hello there this is a bad <?string?> that 
we need to take away. Here is another bad <?st
ring?> that needs to go too.
##</code><code>##

#!/usr/bin/perl
use strict;

print "Info: ARGV is: @ARGV\n";

while (<STDIN>) {
        chomp;
        if (-e $_) { # a regular file (might be suited to your needs)
          # do something with $_ as if it were shifted from @ARGV
           print "handling file: $_\n";
	   	open IN, "<$_" or die "Can't open $_: $!\n";
		open OUT, ">outfile" or die "Can't open outfile: $!\n";
		while (<IN>) {
			s/<?string?>/<xxx>/g;
			print OUT;
		}
		close IN;close OUT;
        } else {
           warn "no such file: $_ \n";
        }
}