nix-channel --add https://nixos.org/channels/nixpkgs-unstable nix-channel --update
nix-env -qa PACKAGE_NAME # or use nox, install with nix-env -iA nox nox PACKAGE_NAME
nix-env -i PACKAGE_NAME
nix-env -e PACKAGE_NAME # same as nix-env --uninstall PACKAGE_NAME
nix-collect-garbage -d
nix-env -q
vi /etc/nixos/configuration.nix nixos-rebuild switch nix-env --list-generations
ref:
http://nixos.org/nix/manual/#chap-quick-start
https://nixos.org/wiki/Cheatsheet
https://distrowatch.com/dwres.php?resource=package-management