enh-du is a highly-portable, high-performance,
POSIX-conformant reimplementation of the du command.
It has some nice features to help you better understand where all
that disk space is going. If you find your current system
du is buggy or unacceptably slow, or if you find some
of the added features appealing, you might want to try this. You
will NOT suffer a performance penalty to get these new features.
This version probably compares well with the version of du
your vendor ships.