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Plumbing Vs Porcelain Commands
- Git exposes low-level "plumbing" commands for scripts and internals and high-level "porcelain" commands for day-to-day use.
- Use plumbing like git-cat-file to inspect raw objects when you need internal visibility.
Content-Addressable Object Store
- Git stores content-addressable objects under .git/objects using compressed files named by SHA-1 hashes.
- Use git-cat-file to reveal an object's type and contents because files are zlib-compressed with headers.
Why Git Uses Content Hashes
- Git is distributed, so identifiers are content hashes rather than centralized incremental numbers.
- Everyone agrees on object SHAs, enabling offline work and later reconciliation with remotes.