git-gc

Run garbage collection

$ git gc

$ git gc --aggressive

$ git gc --prune=now

$ git gc --auto

$ git gc --quiet

git gc [options]

git gc (garbage collection) cleans up unnecessary files and optimizes the repository. It packs loose objects, removes unreachable objects, and compresses the repository.
Git runs gc automatically after certain operations. Manual gc is useful after history rewrites or large imports. Aggressive mode does deeper optimization but takes longer.
git gc maintains repository health and performance.

--aggressive

More thorough optimization (slow).

Prune objects older than date.

Only run if needed.

Suppress output.

Force gc even if another running.

Display help information.

Aggressive is slow. Running gc removes dangling objects. Let gc complete before other operations.

git gc is a core Git command for repository maintenance, automating cleanup tasks that were originally separate commands.

git-prune(1), git-repack(1), git-count-objects(1)