Locked down OS for kids learning to code

I remember growing up coding on an old version of linux with just a terminal. It was amazing, no distractions of the internet. I followed books and manipulating the little pixels was a blast.

I feel, anecdotally, that this is a good way to introduce programming to children.

Is there a locked down OS with some basic scripting ability that could be loaded onto a low powered laptop so that children could experiment and learn to code?

If not, do you have suggestions on a quick way to whip something like that together?