Control + , in Terminal.app

Question

I use the shortcut C-, with the window version of emacs.

(global-set-key (kbd \"C-,\") \'dabbrev-expand)

My problem is that th

Answer 1

Control-Comma does not map to a control character in the system keyboard map. Therefore, it is sent to applications as just a comma. Terminal then sends this comma to the tty, where Emacs receives it. If you want Control-Comma to map to a control character or other sequence that Emacs can distinguish from a normal comma, you'll have to alter the system keyboard map. Doing so is left as an exercise for the reader.