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When I run revert-buffer in emacs it says:

You can run the command `revert-buffer' with s-u

I've never seen any keybinding beginning with s- before. What key is that?

My emacs version is GNU Emacs 23.2.1 (x86_64-apple-darwin, NS apple-appkit-1038.29) of 2010-05-08 on black.local

Update: Now I see why I didn't understand s-u. It is something added by aquaemacs. The first thing I did after installing aquaemacs was (setq mac-command-modifier 'meta) to make it work the way I expect.

dar
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  • Re update, I never installed aquaemacs on my mac. I use plain emacs 25.* with no gui, yet I get the s-u. I tried "command-u", all I get is a bell sound. – Oskar Limka May 10 '17 at 09:39

1 Answers1

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It's the Super Key, similar to Meta. More information in this StackOverflow answer.

Community
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roguesys
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    By default, Emac's super key is bound to apple's Command key on for emacs built with the NS or NextStep option. At least that was the case on my copy. – Shannon Severance Oct 30 '10 at 00:10