Login shell
===========

I prefer to use the Z Shell (zsh). I use it as a default shell on my O2 and my
Indy.

But for some reasons I have had the default shell on most of systems (the
bash on my Ubuntu boxes and the ksh at the SDF). 

Obviously, it is a bit stupid to manually change shell after login (exec zsh).
So I finally managed to fix this issue and now I do have the Z Shell everywhere
(except the  old SGI Indigo, of course).