nix-store

Manipulate or query the Nix store. See also: tldr nix3 store. More information: https://nixos.org/manual/nix/stable/command-ref/nix-store.html.

• Collect garbage, such as removing unused paths:
  nix-store --gc
• Hard-link identical files together to reduce space usage:
  nix-store --optimise
• Delete a specific store path (must be unused):
  nix-store --delete {{/nix/store/...}}
• Show all dependencies of a store path (package), in a tree format:
  nix-store --query --tree {{/nix/store/...}}
• Calculate the total size of a certain store path with all the dependencies:
  du -cLsh $(nix-store --query --references {{/nix/store/...}})
• Show all dependents of a particular store path:
  nix-store --query --referrers {{/nix/store/...}}