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# Examples

* Optimise the Nix store:

  ```console
  nix store optimise
  ```

# Description

This command deduplicates the Nix store: it scans the store for
regular files with identical contents, and replaces them with hard
links to a single instance.

Note that you can also set `auto-optimise-store` to `true` in
`nix.conf` to perform this optimisation incrementally whenever a new
path is added to the Nix store. To make this efficient, Nix maintains
a content-addressed index of all the files in the Nix store in the
directory `/nix/store/.links/`.

)""

Title: Nix Store Optimisation
Summary
The `nix store optimise` command deduplicates the Nix store by finding identical files and replacing them with hard links. The `auto-optimise-store` option in `nix.conf` enables incremental optimisation using a content-addressed index in `/nix/store/.links/`.