Two Questions

How come Red Hat has two versions of rc.local, one in /etc and another
in /etc/rc.d? How come I can't get either one to work?

I recently switched from tcsh to zsh. Not that I have anything against
tcsh. It's still the best interactive shell out there. Anyway, in TC if
you change something in one of your startup scripts, you can type
'rehash' and it's as if you logged in again. The shell re-initializes
itself based on the new scripts. How do you do this in zsh?