Tue May 18 21:01:29 PDT 2010
-->du -ks htdocs
10239443        htdocs

-->bc
scale=2
10239443 * 1024
10485189632 bytes 10,485,189,632 using about 10.5GB

Sat Sep  3 12:45:58 PDT 2011

27,086,908,416 bytes du -s from slash, /

>-||>pwd
/var/apache2/2.2/htdocs
>-||>du -k -s
20960477        .
>-||>bc
scale=2
20960477 * 1024
21,463,528,448 bytes from /var/apache2/2.2/htdocs

27086908416 - 21463528448
5,623,379,968 other space, overhead etc, not part of
/var/apache2/2.2/htdocs