Why does macOS Catalina use Zsh instead of Bash? Licensing

Yesterday, at its WWDC developer conference, Apple unveiled the latest version of the MacOS operating system. Codenamed Catalina, it’s a fairly significant update for the platform, not least because of the changes that have taken place under the hood. Take, for example, the default shell, which has been migrated from Bash to Zsh. Oh shit! https://t.co/FweoKhQTNr pic.twitter.com/s74KeTKBPz — Christina "I Am Sadly not at WWDC" Warren (@film_girl) June 4, 2019 Bash has been the primary