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This looks like it's MacOS only, right? Surely it wouldn't be too hard to get the same stuff working for Linux?

Yes! We are primarily a macOS shop, so I don't see us supporting Linux very much, but you are more than welcome to fork :)

This is pretty useful to me, thanks! I specially like how small the code is: it means I can easily audit it :)

Maybe you should edit the title of this submission and add "Show HN" (https://news.ycombinator.com/showhn.html).

Done, thanks!

Any issues using Catalina? mine shows Error: No YubiKey detected!

No, but try unplugging the YubiKey and trying again. Also, the script officially supports only YubiKey 5, but I've heard that 4 works if you remove the code that checks the version.