Build a Nix expression (downloading from the cache when possible). See also:
nix-buildfor information about traditional Nix builds from expressions,nix flakefor information about flakes. More information: https://nixos.org/manual/nix/stable/command-ref/new-cli/nix3-build.html.
./result:nix build {{nixpkgs#pkg}}
nix build -L {{.#pkg}}
nix build {{./path/to/directory}}
result symlink, instead printing the store path to the stdout:nix build --no-link --print-out-paths