It's also worth pointing out that you haven't created a multidimensional array. Therefore, $url_info[$index][0] won't give you what you want.

While we're at it, go ahead and print out the error code if the open() fails.

Try reading the INPUT filehandle like this:

open(INPUT, '< graduate.output.txt')
     or die "Couldn't open the file for reading: $!";

while(<INPUT>) {
  chomp;
  my $@a = split /,/;
  push(@url_info, \@a);
}

close(INPUT);
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