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)