Synching volumes on logout

[David Baron <d_baron@012.net.il>]

This would be a good idea. Sometimes, the shutdown fails leaving a damaged 
volume. I just did a manual fsck as well and good but it is a bit scarey :-)

How might I assure such a logout synch? Is there a utility to do this? 
Unmount;mount ?

General question: How does one set up a login and logout script -- such as to 
start certain application (OK, KDE will keep your session, but...) but such a 
login script is obviously being run and doing a knoppix desktop setup of some 
kind. There must also be some way of a logout script as well.