There is a bonus too: we won't need the loops in
/etc/cron.daily/tumgreyspf since find nicely removes all the empty
dirs for us.
Example:
$ mkdir -p a/b/c/d/e/f
$ find a
a
a/b
a/b/c
a/b/c/d
a/b/c/d/e
a/b/c/d/e/f
$ find a -mindepth 1 -type d -empty -delete
$ find a
a
And just one minor fix is needed on my example before (otherwise there
is a risk of removing /var/lib/tumgreyspf/data/):
find ${greylistDir} -mindepth 1 -type d -empty -delete
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