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As an emacs user with experience with a keyboard based 'hud' system, might I recommend an 'apropos' system for discoverability. =)

Yes, sounds like a re-invention of the shell. No problem with that, but it doesn't really sound all that new, imho.

I mash the tab key in bash all the time for completion when looking for a command, perhaps not as advanced as the 'fuzzing', but handy nonetheless.

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