🕵️ Git Reflog – Recover Lost Commits and Track HEAD Movements

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🧲 Introduction – Why Use Git Reflog?

Accidentally deleted a branch? Ran a bad reset or force push and lost some work? 😨 Don’t panic—Git Reflog can save the day.

git reflog is a powerful Git tool that lets you track every change made to the HEAD—even changes that are not visible in Git history or branches. It’s your time machine to restore lost commits, branches, and work-in-progress.

🎯 In this guide, you’ll learn:

• What git reflog is and how it works
• How to recover deleted commits or branches
• Reflog syntax and real examples
• Best practices and common mistakes to avoid

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🔍 What Is git reflog?

git reflog (short for reference log) records every movement of the HEAD (e.g., commits, resets, checkouts, rebases), even if those commits are no longer referenced by a branch.

✅ It helps you:

• Restore lost commits
• Recover deleted branches
• Undo bad reset, rebase, or checkout operations

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🧰 Basic Syntax

git reflog

This shows a chronological list of all recent HEAD updates.

📎 Example Output:

9a4f2c1 HEAD@{0}: reset: moving to HEAD~1
f61e59b HEAD@{1}: commit: Fix login bug
3b7c0a8 HEAD@{2}: checkout: moving from main to dev
d2e2b55 HEAD@{3}: commit: Add navbar styling

Each entry includes:

• Commit hash
• Reference (HEAD@{n})
• Action performed (e.g., commit, reset, checkout)
• Message

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🔄 Recovering Lost Commits with Reflog

Let’s say you accidentally ran:

git reset --hard HEAD~2

Now your last two commits are gone.

✅ Step-by-step recovery:

1. View reflog:

git reflog

Find the commit hash before the reset, e.g.:

f61e59b HEAD@{1}: commit: Fix login bug

2. Reset back to it:

git reset --hard f61e59b

🎉 Your lost commit is now restored.

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🔁 Undoing a Bad Rebase or Checkout

Scenario: You mistakenly rebased and lost changes

1. Run:

git reflog

2. Look for the pre-rebase state, e.g.:

b4a1e1f HEAD@{5}: rebase: checkout main

3. Restore it:

git reset --hard b4a1e1f

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📦 Recovering a Deleted Branch

If you deleted a branch that had commits not merged anywhere:

git reflog

Find the last commit from that branch and recreate it:

git checkout -b restored-branch <commit-hash>

✅ This brings the branch back with its commit history.

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📊 Git Reflog vs Git Log – What’s the Difference?

Feature	git log	git reflog
Tracks history	Only current reachable commits	All HEAD movements (including lost commits)
Shows deleted data	❌ No	✅ Yes
User-facing	✅ Yes (for reviewing project history)	⚙️ More for recovery/debugging
Example usage	git log --oneline	git reflog

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🧠 Useful Reflog Variants

Show reflog for a specific branch:

git reflog show dev

Limit entries:

git reflog -n 5

Show hash only:

git reflog --pretty=oneline

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⚠️ Common Pitfalls

Issue	Fix or Tip
Reflog expired or cleaned up	Avoid running git gc --prune=now too often
Relying on reflog across machines	Reflog is local only
Can’t find commit	Try git fsck --lost-found for orphaned data

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✅ Best Practices

• Use git reflog after destructive operations like:
  • git reset --hard
  • git rebase
  • Branch deletions
• Reflog entries expire (by default after 90 days), so act quickly
• Use it before you panic or think you lost work

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📌 Summary – Git Reflog

git reflog is an invaluable safety net that tracks all HEAD movements—perfect for recovering lost commits, branches, and work. It’s your personal undo button in the Git world.

🔍 Key Takeaways:

• git reflog logs all recent actions, including commits, resets, and checkouts
• Helps recover lost work even after branch deletion or hard resets
• Works locally and expires over time

⚙️ Real-World Relevance: Developers use reflog as a last resort tool to undo mistakes and rescue important code lost during resets, rebases, or force pushes.

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❓ Git Reflog — Frequently Asked Questions (FAQs)

❓ How long does Git reflog retain history?
✅ By default, 90 days. You can customize it via:

git config --global gc.reflogExpire 30.days

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❓ Is git reflog shared with remote repos?
❌ No. Reflog is local only. It does not sync with remotes.

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❓ Can I recover a commit that isn’t in any branch?
✅ Yes. Use git reflog to find the commit and then:

git checkout -b restore <commit-hash>

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❓ What’s the difference between git log and git reflog?
✅ git log shows visible commits, while reflog shows all HEAD movements, even orphaned or deleted ones.

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❓ Can reflog restore changes after a reset?
✅ Yes. Use:

git reflog
git reset --hard <previous-hash>

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