@Schnitter
It is apparent that you don't know what jailbreak is. It is possible to jailbreak without installing Cydia. In fact, Cydia didn't even exist until after iOS 2 came out. I jailbroke my iPod touch before Cydia even existed.
Jailbreaking is simply a process that allows you to install 3rd party applications on your device. These third party applications could be installed through SSH, it doesn't require a gui. Now stop trying to correct people when you have no idea what you're talking about.