SillyMonk,
Traditionally, you would be asked to show what you have so far. You would also be admonished for such a poor node title. I am tired and cranky and want to forget about my problems so I am working on yours.

#!/usr/bin/perl -T
use strict;
use warnings;
use CGI;

my $q = CGI->new();
print $q->header;

my $other_value = 42;

open(my $fh, '<', 'input.file') or die "Unable to open 'input.file' fo
+r reading: $!";
while (<$fh>) {
    s/^\s+|\s+$/g; # strip whitespace
    $_ += $other_value;
    print "$_ ";
}
[download]

I haven't tested this. I don't know what your real data looks like. I have glossed over the fact you probably should be using HTML::Template or other templating for your output.