While going through many answers on Unix.SE, I come across many of them writing their contents w.r.t to Posix or Bash or some other standard. I know of some differences like some have arrays and some don't, and other system level differences which I am not completely aware of.Which one of them is the most widely used? In which should we go into for advanced scripting? What are the things that matter for a bash script-er to script in another shell or standard or the other way round?
What is difference between POSIX and bash and other shell scripts?
bash;shell;scripting;posix