Something you can use

[Grumpy]

http://gd.tuwien.ac.at/linuxcommand.org/script_library.php
rh-errata

by William Shotts, Jr.

rh-errata is a tool for maintaining the integrity of a Red Hat Linux system. 
It builds a respository of RPM files from a designated mirror of the Red Hat 
updates site. It only downloads RPM files that have not already been 
downloaded. Optionally, it can produce a report that shows which RPM files in 
your respository need to be updated and which ones have already been 
installed.

View README

View Script

Download the rh-errata package