This command verifies the health of a Git repository by scanning its object database for missing or corrupted objects and validating their links.
It operates by traversing the repository’s internal object store to ensure each commit, tree, blob, and tag is present and correctly referenced, reporting any errors it encounters; you can modify its behavior with flags such as --full to perform a more exhaustive check, --strict to treat dangling objects as errors, --no-dangling to ignore dangling objects, or --lost-found to write unreachable objects into .git/lost-found.
For deeper checks, you might run git fsck --full or combine flags like git fsck --full --strict, and commands that complement or extend its functionality include git gc to clean up unnecessary files, git prune to remove unreachable objects, and git repack to optimize repository storage.