[dolni]

I write a lot of shell and my advice is don't use plain POSIX shell. Write bash.

It is 2025. bash is present almost everywhere. If, by chance, your script is run somewhere that doesn't have bash then guess what?

Your POSIX script probably won't work anyway. It will be a different system, with different utilities and conventions.

Line count is not a good reason to choose or avoid bash. Bash is quite reliably the lowest common denominator.

I dare say it is even the best choice when your goal is accomplished by just running a bunch of commands.

All that said, bash is gross. I wish we had something as pervasive that wasn't so yucky.