[NTLUG:Discuss] Eject CD before reboot?

[Keller Giacomarro]

Much thanks for all the awesome help in the past - it's been 
invaluable.  Got another one for you guys:

I'm creating an automated CD to image computers for a school lab.  I've 
written a custom script with a 'reboot' at the end.  However, there is 
no opportunity to have the user remove the CD before the reboot.

If I put a pause and an eject before the reboot, the filesystem won't be 
unmounted, so it can't eject.

Is there a way to get Linux to eject the CD after shutting everything 
down, and then giving a pause for the user to remove the CD?  I've seen 
Ubuntu do it before to remove the LiveCD, but I'm not sure how to figure 
out how they do it.

Thanks in advance for the great advice. =)

-Keller