Handling CD/DVD from shell

To create the ISO image:

$ genisoimage -RJ -o image.iso dir1/ dir2/

To burn ISO to CD:

$ cdrecord -v -eject speed=8 dev=/dev/cdrom image.iso

To burn ISO to DVD:

$ growisofs -dvd-compat -Z /dev/cdrom=image.iso -speed=2

And finally - ripping/dumping a CD/DVD to an ISO image:

$ dd if=/dev/cdrom of=image.iso