nix-super/doc/manual/src/command-ref/nix-collect-garbage.md

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# Name
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`nix-collect-garbage` - delete unreachable store paths
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# Synopsis
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`nix-collect-garbage` [`--delete-old`] [`-d`] [`--delete-older-than` *period*] [`--max-freed` *bytes*] [`--dry-run`]
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# Description
The command `nix-collect-garbage` is mostly an alias of [`nix-store
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--gc`](nix-store.md#operation---gc), that is, it deletes all
unreachable paths in the Nix store to clean up your system. However,
it provides two additional options: `-d` (`--delete-old`), which
deletes all old generations of all profiles in `/nix/var/nix/profiles`
by invoking `nix-env --delete-generations old` on all profiles (of
course, this makes rollbacks to previous configurations impossible);
and `--delete-older-than` *period*, where period is a value such as
`30d`, which deletes all generations older than the specified number
of days in all profiles in `/nix/var/nix/profiles` (except for the
generations that were active at that point in time).
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# Example
To delete from the Nix store everything that is not used by the current
generations of each profile, do
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```console
$ nix-collect-garbage -d
```