Once you are done with your changes, it is time to compress the KNOPPIX/KNOPPIX filesystem and make the burnable CD ISO:
$ mkisofs -iso-level 4 -R -U -V "My LiveCD" -hide-rr-moved -cache-inodes -no-bak -pad /home/knoppix/ knoppixuncompressed | nice -5 create_compressed_fs - 65536 > /home/knoppix/knoppixiso/KNOPPIX/KNOPPIX
Please be aware that this command should be executed on a single line, and it will take a long time to run, depending on the size of the /home/knoppix/knoppixuncompressed directory and the speed of your machine.
When the command is finished, you create the final ISO:
$ mkisofs -pad -l -r -J -v -V "My LiveCD" -b boot/ isolinux/isolinux.bin -c boot/isolinux/boot.cat -no-emul -boot -boot-load-size 4 -boot-info-table -hide -rr -moved -o /home/knoppix/my-livecd.iso /home/knoppix/knoppixiso
If everything goes well, the final ISO should exist at /home/knoppix/my-livecd.iso.