You're confusing reading of files with writing to files. Use the diamond operator (<OUTPUTFILE>) to read from a file. When you're writing to a file, there's no need to use the diamond operator, and in fact it won't work to use it.

Here's how to do it:

open( OUTPUTFILE, '>', $position_output_path )
    or die "Couldn't open $position_output_path\n$!";
foreach my $row ( @rows ) {
    print OUTPUTFILE $row, "\n";
}
close( OUTPUTFILE )
    or die "Couldn't close $position_output_path\n$!";
[download]

That ought to do the trick!