how to exec a process in a jail while being on the main host?

[Wojciech Puchar]

> on the main host (which runs the jail).
> How can i run a new process inside the jail with a known JID w/o ssh-ing into 
> that jail or doing a lot of strange
> manupulations?
>
> I am asking, because i have about 20 jails running and each has a running 
> special control daemon which
> changes a lot and often. When change occures i need then to enter each jail 
> as root, kill the old daemon, start the new one.
> This take a lot of time and is really annoying.

man jexec