!!! Overview
[{$pagename}] the [UNIX] ([BSD]) based [Operating System] used by [Apple]

!! [macOS Catalina|MacOS.10.15] 
[MacOS.10.15] will now use [zsh] as the default [Login Shell] and interactive shell across the [{$pagename}] [Operating System]. All newly created user accounts in [MacOS.10.15] will use [zsh] by default. [Bash] will still be available, but [Apple] is signaling that developers should start moving to [zsh] on [macOS.10.14] or earlier in anticipation of bash eventually going away in [{$pagename}].

[Apple] hasn’t explained exactly why it’s making this change, but [bash] isn’t exactly a modern shell as it’s implemented in macOS, and a switch to something less aging makes a lot more sense for the company. Apple is stuck using [version] 3.2 of [bash] that has been licensed under [GPLv2], as newer versions are licensed under [GPLv3]. [Apple] has kept clear of using [GPLv3] packages in [{$pagename}] as the license is generally more restrictive to companies like [Apple] that sign their own code and it includes explicit [patent] grants

!! More Information
There might be more information for this subject on one of the following:
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* [#1] - [Apple replaces bash with zsh as the default shell in macOS Catalina|https://www.theverge.com/2019/6/4/18651872/apple-macos-catalina-zsh-bash-shell-replacement-features|target='_blank'] - based on information obtained 2019-06-04