Debian Policy dictates that /etc/init.d/*.sh scripts must work properly
when sourced. The following additional rules apply:
* /etc/init.d/*.sh scripts must not rely for their correct functioning
on their being sourced rather than executed. That is, they must work
properly when executed too. They must include "#!/bin/sh" at the top.
This is useful when running scripts in parallel.
vpj-cd
Carlos Ruiz
Heng Sin Low