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 (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).

Example

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

       $ nix-collect-garbage -d

                                                                                          nix-collect-garbage(1)