Occasionally, we may still need emacs for small editing, but on Catalina or Big Sur, emacs is not available. There are some options: one is to use
vi instead. Another is to install
emacs using Homebrew. The third option which can be simple is just to use
mg. It is MicroGnuEmacs and when you use it, you can use the familiar keystrokes as in emacs.
Note it is already pre-installed on Catalina or Big Sur. There is no need to install it.
If you are used to typing
emacs and using
git, simply change the zsh alias in
git config --global core.editor mg