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A comment on Use zsh as the default shell on your Mac. Parent comment

Re:Use zsh as the default shell on your Mac by danieldk on Tuesday June 04, 2019 @03:19AM (#20092658)
The default bash on macOS is protected using SIP. Files covered by SIP can only be replaced by Apple-signed updates.

(Of course, one could disable SIP altogether.)

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Re:Use zsh as the default shell on your Mac by tobylane on Wednesday June 05, 2019 @09:52AM (#20104306)
The bash4 from homebrew is installed to a different place to the system bash, and even when you switch to it as your login shell the system bash is still accessible. The homebrew design is never to overwrite system programs but to have same named alternatives higher in $path.
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Re:Use zsh as the default shell on your Mac by aasasd on Tuesday June 04, 2019 @03:41AM (#20092797)
Somehow I don't think GPLv3 presumes that you'll replace system files. And I'm using Homebrew versions of system-bundled utils just fine without overwriting them.
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