macOS emacs in the terminal (no GUI) Since the update to macOS Catalina, I installed Emacs separately using brew cask install emacs. Now when I type emacs in Terminal, Emacs is opened in a separate window with a GUI (the Emacs.app?). How do I get back to just a plain old Emacs in the terminal with no GUI?
You should be able to run

emacs -nw


(„no window“) to prevent it from opening a new window.