nix run github:nix-community/home-manager -- switch --flake .After the first run, home-manager is available directly, and so you can do:
home-manager switch --flake .Since this repository is a nix flake (basically a self-contained nix package), upgrading software is a single command away:
nix flake update .nix-config % nix --extra-experimental-features "nix-command flakes" run github:zmre/pwzsh