
This command was useful when NixOS was spread across multiple repositories, but now it's pretty pointless (and obfuscates what happens, i.e. "git clone git://github.com/NixOS/nixpkgs.git").
*** NixOS *** NixOS is a Linux distribution based on the purely functional package management system Nix. More information can be found at http://nixos.org/nixos and in the manual in doc/manual.