I believe your warning is coming from the uninitialized $_ that you are concatenating, but that is really the least of your worries. The following section runs an infinite loop:

while () {
$temp = $temp . $_ . "
";
}
[download]

I think you meant:

while (<FILEHANDLE>) {
 $temp .= $_;
}
[download]

update: forgot to put parens around the while

   MeowChow                                   
               s aamecha.s a..a\u$&owag.print