Is there a way to use CommandOptionControlShift, as hotkey?

The same modifier keys (CommandOptionControlShift) work fine with letters, but I can't seem to make it do anything when using the , key.

Is it a system hotkey that needs to be removed from a plist somewhere? Or is it something deeper that can't be reassigned at all?

  • idk what it does, but I can't assign it either [El Capitan]
    – Tetsujin
    Sep 27, 2017 at 16:59
  • Control-Option-Command-Comma (,) is a shortcut for the screen (i think) so commas are allowed it seems.
    – Natsfan
    Sep 27, 2017 at 20:52
  • Also, Command-, opens the preferences for the focused app. Sep 28, 2017 at 0:40

2 Answers 2


Command-Option-Shift-Control-, starts a system diagnose process. I'm not really sure about the specifics, but try it and you'll get a zip archive with some information in it.


I was able to hotkey CommandOptionControlShift, in Spectacle and XCode by inputting CommandOptionControlShift+/+, where /+, are input as separate keystrokes.

In Spectacle it listed the binding as ,.

In XCode it listed the binding as <.

To trigger the hotkey, you must input CommandOptionControlShift+/+,

  • Good find! I will note, that, when triggering the hotkey, you still you still must input / and , as separate keystrokes. Mar 13, 2018 at 15:26

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