$ nix-shell -p nix-info  --run nix-info
system: "x86_64-linux", multi-user?: yes, version: nix-env (Nix) 1.11.16, channels(blob): "", channels(root): "nixos-17.09.3194.edf1079d43f", nixpkgs: /nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs