It'd be nice if there was a command line option for this actually. I have my machine setup almost entirely automated, but this is one of the manual steps I have to do.

As far as I know, it used to be just a matter of writing the plaintext license into the appropriate file: https://forum.sublimetext.com/t/license-installation-silentl...

That's still supported, and the same technique works for Sublime Merge, fwiw.

Awesome – thanks for sharing!

Completely off topic but would you care to describe how you install your system automatically?

It's really nothing fancy, just based on strap[1] but then modified a bit. I keep my dotfiles in github and leverage homebrew for installing pretty much everything.

[1]: https://github.com/mikemcquaid/strap

Sounds like NixOS: https://nixos.org/