how do I expand an iso image on linux

[duncan <duncan@xxxxxxxxx>]

stupid question.

 I had a lot of problem getting RH9 cd's to copy on to my kickstart 
server.

I copy everything over as I did when I successfully setup my RH7.3 
images. Unfortunately, when I try my new ks install via the RH9 image, 
I get a "Unable to read header list" error.

So I want to pull-down new ISO images, and extract them directly on my 
Linux server dedicated to kickstart, but I don't know how to expand the 
ISO images on linux.

Help.