#!/usr/bin/perl -w

use strict;
use FindBin;
use File::Spec::Functions;

my $file = catfile($FindBin::Bin, updir, 'data', "output.txt");

open F, ">$file" or die "Cannot open '$file': $!\n";
binmode F, ':raw';
binmode STDIN, ':raw';
while (<STDIN>) { print F }
close F;