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My Emacs uses the Mac alt/option key as the meta key. How do I set it to be the ⌘ key?

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up vote 13 down vote accepted

This is what I have in my .emacs file:

;;; I prefer cmd key for meta
(setq mac-option-key-is-meta nil
      mac-command-key-is-meta t
      mac-command-modifier 'meta
      mac-option-modifier 'none)

(If you're unfamiliar, just add these lines to the file ~/.emacs (or create it if it doesn't exist), and restart Emacs.)

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Additionally, if you want your option key to behave as super, you should set mac-option-modifier 'super. I find the super key useful as it helps me navigate between my windows. – Indradhanush Gupta Oct 19 '14 at 15:53

There is a setting that can be put into your .emacs: mac-command-key-is-meta that you can set to any non-nil value to enable.

Turning this setting on may cause strange characters to be printed, especially if you are running Leopard or higher. In order to correct that, you will need to set set-keyboard-coding-system to nil in your .emacs config.

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If you're not averse to remapping the key globally, you could also look at Doublecommand. It permanently remaps keys as you specify across all applications. Being an emacs user on a MacBook Pro that doesn't have a right-hand CTRL key, I found this to be invaluable: I remapped my right-hand option/alt key to be a CTRL key. Works like a charm.

Of course if you want to avoid having it remapped globally, then the previous answer would probably be a better course to take.

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