A short program is just a long program that isn't finished yet. Always use use warnings;. Always use use strict;.

Do that now, and see what progress you achieve.

Once you get past declaring $dir, $directory_count, $file_count and $outfile, you will discover that your for-loop is iterating over and undefined array, @dirs. Since @dirs is empty, you never enter the loop, so no print statements.

No, we can't re-write it for you, do your own homework.