Name
nix-collect-garbage - delete unreachable store paths
Synopsis
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, 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