At this point you should have a working CJ11, and a device in your home installation. It's time to install in your Linux the software to manage your devices. It's called heyu.
You can obtain it here, it won't be in any of your favourite linux distros, cause of the special license of the software, basically:
The full text is here
In any case it worth the hassle of having to go to the site and donwload the software, since it makes controlling your X10 devices terribly easy.
[caption id="attachment_60" align="alignleft" width="128" caption="Lamp module LM12"]