Okay, Debian gurus... a challenge.

[Ken D'Ambrosio]

Somehow, by hook or by crook, /usr/lib on one of our servers up and 
vanished.  I've recovered enough files from other sources that I can now 
run (say) apt-get, among most (but by no means all) others.  So, can 
anyone give me the apt-get-command-from-hell that would examine all the 
packages currently installed, and either
a) re-install their /usr/lib files, or, failing that,
b) re-install all their non-config files, or, failing _that_,
c) re-install _all_ their files (I have a backup of all config data,
   so it's not like I'd be starting from scratch).

Thanks...

-Ken