For anyone struggling with the `shuf` bit, it's part of GNU Coreutils. `brew install coreutils` would be a good start on a Mac (if you're lost at `brew`, this i

For anyone struggling with the `shuf` bit, it's part of GNU Coreutils. `brew install coreutils` would be a good start on a Mac (if you're lost at `brew`, this is probably not for you!).