I created a script that, when executed, leaves the user with a blank screen where he can only type, much like a typewriter. It's a Python script, and I intend to port it to pure Bash eventually.
Now I want to generate a LiveUSB where this script runs at startup, and the one and only thing you can do when you boot is type text (and of course you should be able to turn off the system somehow). I don't even want any GUI, or any way for the user to bypass this "home screen". I want it to be a single-purpose, "Kiosk mode" CLI environment. This is similar to PyRoom, only at the level of the OS and without a GUI.
So the question is (and I am not quite experienced with boot configuration): what would be the typical steps do achieve that? Where should I put the script, and how do I tell the booting system to run it right away at startup?