Is there a way to use the Apple command key in Emacs in the terminal? It would be nice to expand the set of easy to get at key bindings I can use.
The answer below tells you how to use Command as a second, redundant Meta key, which is pointless. As far as I know, it's not possible to use Command as a distinct modifier key in Terminal/iTerm---say, by mapping Command it to the Hyper key, for instance---the way you can with GUI Emacs.
cmd-key-happy will do this for Terminal - and other applications.