Sample rpm comands:
Verify integrity of all packages on the system:
rpm -Va
Verify the integrity of a single file:
rpm -Vf /bin/login
What package does a file belong to?
rpm -qf /bin/login
List the files in a package:
rpm -ql util-linux-2.11n-12
The Midnight Commander, mc, is a good program to know about when dealing with rpm's as it can show the contents of and extract individual files from .rpm files fairly easily.