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I find it interesting that Apple actually downgraded to an older version of bash at some point to avoid the GPLv3. I reference it in a post about Open Source and business I wrote two years back:

http://penguindreams.org/blog/the-philosophy-of-open-source-...

I really don't understand why they haven't made ZSH the default. It has a much more powerful REPL and a more permissive license.

I'm not a frequent Mac user, but I wonder about the bash 3 thing too.

Maybe they just expect you to install your own shell? I think a lot of people do that with homebrew?

I think Apple has largely expunged shell scripts from the startup process with launchd too? That is like their systemd.

fish is released under GPLv2 and afaik Apple has a policy to not include any new GPL software in macOS.

I think GPLv2 is fine, GPLv3 is what stopped them from using new versions of Bash. But I'm sure they would prefer MIT, Apache, BSD, etc