nix-collect-garbage

1

Nix

nix-collect-garbage

delete unreachable store paths

nix-collect-garbage

\--delete-old

\-d

\--delete-older-than

period

\--max-freed

bytes

\--dry-run

# Description

The command `nix-collect-garbage` is mostly an alias of [`nix-store
--gc`](#rsec-nix-store-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).

# Example

To delete from the Nix store everything that is not used by the current
generations of each profile, do

    $ nix-collect-garbage -d