I know Catalina uses zsh as the default login shell and interactive shell, But it is very annoying when I open iTerm.app or run command with
/bin/bash, It shows verbose message like below
$ /bin/bash The default interactive shell is now zsh. To update your account to use zsh, please run `chsh -s /bin/zsh`. For more details, please visit https://support.apple.com/kb/HT208050.