This was probably ~20 hours over two weeks. (I'm the author of the post.)
Re:NixOS on Prgmr and Failing to Learn Nix
by vaibhavsagar on Monday July 16, 2018 @03:03AM
(#17539311)
The command is still `nix-shell`, `nix shell` is the next-generation replacement but unfortunately it's still not at feature parity with the old command.
NixOS seems like it is from the future in my opinion. I agree the docs are outdated a bit. I had to go on IRC to #nixos to find out nix-shell is now nix shell. I submitted a pull request to the Nix Pills for that.