10-git-log.md

📜 git log (View History)

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🎯 What It Does

Shows commit history.

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🧪 Commands

git log

Short version:

git log --oneline

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📸 Visual (Commit Graph)

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🧠 Mental Model

git log = reading the story of your project

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🏗 Internal Architecture

Git does NOT store history as a list.

It stores it as a graph (DAG):

👉 Directed Acyclic Graph

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🔬 How git log Works

git log:

• starts from HEAD
• follows parent commits
• prints history backwards

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🧩 Example

A ← B ← C ← HEAD

git log shows:

C
B
A

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🔥 Useful Commands

git log --oneline
git log --graph
git log --all

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⚠️ Common Mistake

Thinking history is linear.

👉 It becomes complex with branches.

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🧠 Why This Matters

Because:

• debugging depends on history
• merges create graphs
• rebasing rewrites history

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🧠 Memory Trick

git log = history viewer

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➡️ Next Step

👉 11-git-diff.md