How to know total number of bytes of a directory

[Barry Byrne]

 > -----Original Message-----
> From: owner-freebsd-questions at freebsd.org 
> [mailto:owner-freebsd-questions at freebsd.org] On Behalf Of DSA - JCR
> Sent: 17 December 2007 13:38

> Hi all
> 
> I would like to know the total number of bytes of a directory and its
> related subdirs, occupied by the files inside it. I haven't found any
> command for knowning it.

man du

 - barry