Remove extra objects that are already in pack files
Man Page
Description
This program searches the $GIT_OBJECT_DIRECTORY
for all objects that currently
exist in a pack file as well as the independent object directories.
All such extra objects are removed.
A pack is a collection of objects, individually compressed, with delta compression applied, stored in a single file, with an associated index file.
Packs are used to reduce the load on mirror systems, backup engines, disk storage, etc.
GIT
Part of the git[1] suite