why are you stuck with bash? just write a shebang and then your interpreter in the first line of your script.
i can use bash, python, lua and al kinds of stuff…
i don’t understand the question. if you mean, why does my shell only accept bash syntax, if i set my shell to bash, idk. use another shell?
‘sh’ is kind of the smallest common thing that’s available everywhere. so when you got to script something that needs to run somewhere not under your control, you use ‘sh’. and that’s kind of it works. you’ll find something, that’s been around for some time, otherwise it won’t have spread everywhere. and now you can’t replace it in newer products, because there is so much stuff using it.
if that isn’t one of your problems, go with my first suggestions and just use python or something like that.