How do you get started with adding voice commands to a computer system?

Let's suppose you want to add support for voice commands to a Linux Distro.

For simplicity's sake, let's say you want to be able to tell the computer (The terminal is running): "Create XY directory" and as a response the directory XY is created on the current directory.

How do you implement such a feature?

Will a Software developer first need to train a system over lots of people pronouncing "Create directory" phrases. And then perform inference on production?

Are some corporations/start-ups already providing trained models for natural language - computer interaction?

How do you get started these sort of tasks these days?

And of course, for accessibility purposes, text-based interaction remains unchanged.

Thanks!