'C-M--' on Emacs Terminal on OSX fails with "C-M-_ is undefined"

Question

I'm trying to execute C-M-- from Emacs on Terminal (iTerm2) running on OSX, but I keep getting an error saying C-M-_ is undefined. Any ideas how to workaround this?

Using M-- works, but makes it a bit awkward for scrolling up on other window. Note that this is Emacs Terminal and hence C-M-S-v does not work. — Galder Zamarreño, Jul 03 '15 at 18:11
possible duplicate of Shift+Up isn't recognized by Emacs in a terminal — PythonNut, Aug 03 '15 at 19:59
@PythonNut Not a duplicate. http://emacs.stackexchange.com/questions/977/shiftup-isnt-recognized-by-emacs-in-a-terminal is definitely useful background, but an answer to this question would explain how to set up iTerm2. Hmm, I've done that before. — Gilles 'SO- stop being evil', Aug 03 '15 at 22:02
possible duplicate of Problems with keybindings when using terminal — Gilles 'SO- stop being evil', Aug 03 '15 at 22:03
@Gilles @PythonNut can you be more specific how this is a duplicate? And @Gilles, any specific ideas on how to solve this? Looking at the output of C-h l, I see ESC C-_ being printed out when I execute C-M-- — Galder Zamarreño, Aug 04 '15 at 11:36
@GalderZamarreño So configure the iTerm2 binding for Ctrl+Meta+-. — Gilles 'SO- stop being evil', Aug 04 '15 at 12:18

score 0 · Accepted Answer · answered Aug 05 '15 at 12:56

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I eventually got this working by going into iTerm2 preferences and adding a new global shortcut key binding where I entered as Keyboard Shortcut ^⌥-, chose Action Send Escape Sequence and just typed - in the Esc+ field. That seems to do the trick.

Thanks @Gilles and @PythonNut for their help :)

answered Aug 05 '15 at 12:56

Galder Zamarreño

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If you're satisfied with this answer, could you please accept it so we can mark it as answered? – Dan Oct 04 '15 at 15:51

'C-M--' on Emacs Terminal on OSX fails with "C-M-_ is undefined"

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