I would like to be able to use CTRL and SUPER key modifiers together in a key binding. Since I'm on Mac OSX I use Command key for SUPER modifier.

I tried this:

(global-set-key (kbd "C-s-i") 'move-line-up)
(global-set-key (kbd "C-s-k") 'move-line-down)

but I get <C-s-268632073> is undefined message in the mini buffer when I press C-s-i combination.

Is there a way to use CTRL and SUPER key modifiers together in a key binding?

  • 1
    Works for me with 25.2.2 on Linux, at least to the extent that C-x @ s C-i runs move-line-up. What version of Emacs are you running? Do you get this message when you run global-set-key or when you press C-s-i? What happens when you press C-x @ s C-i ? Mar 14, 2020 at 20:46
  • @Fólkvangr tried it, but I get Invalid read syntax: "?" when I try to eval-buffer
    – Daut
    Mar 15, 2020 at 7:34
  • @Gilles'SO-stopbeingevil' I'm on GNU Emacs 26.3. I get message when I press C-s-i. I get C-x @ Tab is undefined in the mini buffer when i press C-x @ s C-i
    – Daut
    Mar 15, 2020 at 7:43
  • Did you press C-x @ s C-i, not C-x @ Tab? With a sequence beginning with C-x @ s, you should get a message about a translation. Mar 15, 2020 at 11:38
  • @Gilles'SO-stopbeingevil' OK this sequence works C-x @ s C-i but if I literally press s key, not super.
    – Daut
    Mar 15, 2020 at 15:12

2 Answers 2


Try this instead:

(global-set-key (kbd "s-C-i") 'move-line-up)
(global-set-key (kbd "s-C-k") 'move-line-down)

Dunno whether that works (I don't have a <super> key. The key description C-s means Control + s (character s, not super key).

Be aware, too, that C-i is the same as TAB.

  • 1
    I tried this, but unfortunately, it doesn't resolve the problem.
    – Daut
    Mar 13, 2020 at 20:54

I've just upgraded Emacs from version 26.3 to 27.1 and the keybinding works just fine now.

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