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tldr/pages/common/nix-collect-garbage.md

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nix-collect-garbage

Delete unused and unreachable nix store paths. Generations can be listed using nix-env --list-generations. More information: https://nixos.org/manual/nix/stable/command-ref/nix-collect-garbage.html.

  • Delete all store paths unused by current generations of each profile:

sudo nix-collect-garbage --delete-old

  • Simulate the deletion of old store paths:

sudo nix-collect-garbage --delete-old --dry-run

  • Delete all store paths older than 30 days:

sudo nix-collect-garbage --delete-older-than 30d