You can mount an ISO image of a CD to your filesystem in linux. That means you can read files from the image without burning it onto a disk first.

Make a directory to mount the image to, for example:
mkdir /mnt/iso
Mount the image:
mount image.iso /mnt/iso -o loop,ro
If you get a 'you must specify the filesystem type' or 'Permission denied' error, you probably forgot or mistyped the -o loop,ro part.

Have fun.