Does it exist a command to shutdown gnome in a clean way without user interaction ?

[Djamé Seddah <djame seddah loria fr>]

Hello,
my pc is shutting down every day at 4 A.M so each time, it seems to kill 
everything (result of the command shutdown -h now) but i would like it 
to quit properly my gnome session, so I looked into the gnome-session 
manpage and the panel manage but I didn't find anything about quiting 
properly gnome itself...

I was wondering if it exists a signal or something to make it quit 
without interaction from the user (at this time the user is sleeping) ?




Thanks for reading



Djamé


ps : where should I post usability advice related (the lack of "..." 
after the "preferences" entry menu is very, very weird because it opens 
a dialog box so it should be "..." just as the rest of the interface 
(and the rest of the world) , no ?)