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And that bash 3.2 is one of the reasons I want to turn off rootless so I can install modern bash 4.3 in /bin/bash, so that scripts that have #/bin/bash continue to work unmodified.

Apple will most likely never update their bash to GPL 3.0 bash 4 or later.

You can set your shell per user in /etc/passwd (or similar, can't remember the name)

It's easy to change your default shell, but if you got a shell script that explicitly specifies #!/bin/sh (and they all do) then /bin/sh will be invoked, regardless what your default shell is. So your options are to modify every script file to invoke your default shell (usually #!/usr/local/bin/sh ) or to install your default shell in /bin.

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