I used to use `#!/usr/bin/env bash` for this reason (Linux / MacOS + Homebrew user) but have been bitten a few times by bash version differences when I write a

I used to use `#!/usr/bin/env bash` for this reason (Linux / MacOS + Homebrew user) but have been bitten a few times by bash version differences when I write a script that is later called by a system utility like launchd (which doesn't inherit my PATH) that goes with /bin/bash instead. Because the backwards compatibility tends to be good, if I'm writing a script that will be run non-interactively, I will usually write a fixed `#!/bin/bash` shebang just so I can be sure that it run with the expected bash version on Linux or Mac.