I'm using Mac OSX Yosemite 10.10.4.

I'm trying to use the shortcut option + command + left arrow for Spectacle, but I'm getting an error that claims the shortcut is already in use. I can't figure out where it's being used. I checked System Preferences > Keyboard > Shortcuts, but don't see it in use anywhere. Is there a way for me to search for the shortcut?

  • Are you sure it's the OS claiming it's a duplicate? kbd > shortcuts will only complain if another shortcut in the same window i.e. App Shortcuts is using it. If it's in e.g. Services, it won't notice.
    – Tetsujin
    Mar 23 '17 at 8:24
  • Spectacle is what telling me it's a duplicate. Mar 23 '17 at 16:30
  • Then I can't help, sorry. Never used it.
    – Tetsujin
    Mar 23 '17 at 17:13

Spectacle shows that error message when the shortcut you're trying to set is already in use inside Spectacle.

See this where I tried to set Option+Cmd+Z for "Redo" even though it's already used by "Undo":

Spectacle preferences showing an error on duplicate shortcut

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