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I am trying to define a new shortcut for "Select the previous input source", since the default shortcut (Control + Space) is conflicting with another app I need to use. Is there any table with a list of unused shortcuts in Mojave that could be good candidates for custom shortcuts? I am trying to find a balance between good usability (not having to stretch the hand in awkward positions to type the shortcut) and avoiding conflicts with already existing shortcuts.

  • Firstly, welcome to Ask Different! :) I hope you come to find this site has a lot to offer! In case you haven't already, it's worth taking the time to read the tour. As for your question, I think the difficulty is that you're asking about keyboard combinations for shortcuts in macOS Mojave, but the conflict you're describing is actually with a keyboard combinations used by a 3rd party app. So, getting a list of all keyboard combinations isn't a trivial exercise if you need to know what they are across all apps. Or am I misreading your question? – Monomeeth Sep 7 at 0:39
  • What are your input sources? If one is Latin and one non-Latin,you can use caps lock to switch by checking a preference box. – Tom Gewecke Sep 7 at 1:32
  • How about command plus space? That used to be apple’s default. If it conflicts, change the other one. – Tom Gewecke Sep 7 at 1:35
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Is there any table with a list of unused shortcuts in Mojave that could be good candidates for custom shortcuts?

There is not. There are a few utilities out there which will show you which key combinations are in use¹ but none (that I am aware of) show you available keyboard shortcuts.

¹ I believe KeyCue is the most well-known and best supported.

One common method among Mac power users is the use of a Hyper Key which is (generally speaking) where you remap holding down the Caps Lock key to equal holding down ⌘ ⇧ ⌥ ⌃ because few apps (and few macOS default shortcuts) use all 4 modifiers (mostly because it is awkward to try to press them all at once, which is why remapping the Caps Lock key is recommended).

Personally, I use a Hyper Key with Keyboard Maestro because, unlike shortcuts defined in System Preferences, Keyboard Maestro's shortcuts are easy to backup/restore, and easy to sync across multiple Macs.

  • The “hyper” key - good one... plus 1. Better than the “any” key as in “press any key”... – Solar Mike Sep 7 at 3:51

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