Anonymous: I've got a file that I need to read
into a hash line by line

Just map key/value directly into the hash:

 ...
 my %hash;
 open my $fh,'<', 'input.txt' or die "with style ($!)";

 %hash = map /^Data_Type:([\S]+)\s*([^\n]+)/, <$fh>; # all happens her
+e

 close $fh;
 ...
[download]

You can verify with:

 ...
 print "$_ = > $hash{$_}\n" for keys %hash;
 ...
[download]

Regards

mwa