Writing a shell script or simple command program for Quest 2. Hello VR World!

I'm an old programmer with a new quest 2. Toto, I don't think we're in punch cards anymore. So I want to write a shell script or simple program for my quest 2. "Hello World" level. So where do I even begin?

Goal: shell script on my headset to load some ADB commands. (And give Taylor Swift a call while making some tiramisu and caramel mocha latte while fixing climate change. Ok. Maybe not the last one so much.)

Any guides/pointers/newbies here?

Thanks!
Oh! Hi Taylor ;-)