I stick with bash to avoid implementation differences due to POSIX ambiguity [0]. I know that all my bash scripts will run on at least bash-4.0 but I have no id

I stick with bash to avoid implementation differences due to POSIX ambiguity [0]. I know that all my bash scripts will run on at least bash-4.0 but I have no idea what shell /bin/sh is going to be for any given system. I haven't written a single shell script where the performance difference matters, nor do I expect to. And there are a few nice bashisms besides arrays. I'm not sure what portability issues you're referring to. [0] https://stackoverflow.com/a/16376043 https://stackoverflow.com/a/16376043