Common subdirectories: /var/tmp/difftest/b/1 and /var/tmp/difftest/a/1
diff --unidirectional-new-file /var/tmp/difftest/b/tzu /var/tmp/difftest/a/tzu
0a1,13
> The Nameless is the origin of Heaven and Earth;
> The named is the mother of all things.
> 
> Therefore let there always be non-being,
>   so we may see their subtlety,
> And let there always be being,
>   so we may see their outcome.
> The two are the same,
> But after they are produced,
>   they have different names.
> They both may be called deep and profound.
> Deeper and more profound,
> The door of all subtleties!