GIT Rebase vs GIT?Merge

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What is Git?Rebase?

Git rebase is a Git command that moves or applies commits from one branch onto another, effectively creating a linear sequence of commits. It achieves this by replaying the commits from the source branch onto the target branch, rewriting their history.

Key Points about git rebase:

1. Linear History: Rebase ensures that the project’s commit history is clean and linear, avoiding unnecessary merge commits.
2. Rewriting History: It rewrites commit hashes since it applies the commits on top of the target branch.
3. Use Cases:

• Clean up local branch history before sharing with others.
• Synchronize feature branches with updates from the main branch without creating merge commits.

What is Git?Merge?

Git merge is a Git command that integrates changes from one branch into another. It creates a new merge commit that combines the histories of both branches without altering their previous commits.

Key Points about git merge:

1. Preserves History: Merge retains the original commit history and creates a new merge commit to combine changes.
2. Non-Destructive: Unlike rebase, merge does not rewrite commit history.
3. Use Cases:

• When you want to preserve the full history of all commits.
• For integrating changes from one branch into another without altering commit hashes.

Difference Between Git Rebase and Git?Merge

Example: Git Rebase vs Git?Merge

Scenario:

You have two branches:

• main: The primary branch.
• feature: Your feature branch with new commits.

1. Using Git?Rebase

# Switch to the feature branch
git checkout feature        

# Rebase the feature branch onto main
git rebase main        

• The commits from the feature branch are applied on top of main, resulting in a linear history.
• You may need to force-push (git push --force) if the branch is already shared.

2. Using Git?Merge

# Switch to the main branch
git checkout main        

# Merge the feature branch into main
git merge feature        

• A new merge commit is created in the main branch, keeping the commit histories of both branches intact.

When to Use?What?

Use rebase:

• When working on local feature branches.
• When you need a clean, linear history.

Use merge:

• For integrating changes into shared branches.
• When preserving the full commit history is essential.

Pro Tip: For collaborative workflows, prefer merge to avoid rewriting shared history. For personal workflows, use rebase for cleaner commit logs.

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