How to Use Git Rebase: Step-by-Step Tutorial

How to Use Git Rebase: Step-by-Step Tutorial

TL;DR: Use Git rebase to move a sequence of commits to a new base commit, creating a linear history. Execute the command on a feature branch to update it with the latest changes from the main branch before merging.

Understanding the Basics

Git rebase is a powerful command that allows you to rewrite your commit history by moving or merging a sequence of commits to a new base commit. Unlike merging, which creates a new merge commit and preserves the branch topology, rebase applies your commits on top of another head, resulting in a clean, linear history. This approach is particularly useful for keeping feature branches up-to-date with the main development line without cluttering the repository with unnecessary merge commits. However, you must use rebase with caution, as it rewrites history, which can be dangerous if you have already pushed your commits to a shared remote repository.

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Step-by-Step Instructions

First, ensure your working directory is clean. Run git status to verify that you have no uncommitted changes. If there are any, commit them or stash them using git stash. Next, switch to the feature branch you wish to rebase using git checkout feature-branch. This ensures that you are modifying the correct set of commits. Do not rebase the main or master branch directly, as this affects all other branches based on it.

Now, execute the rebase command. If you want to update your feature branch with the latest changes from the main branch, run git rebase main. Git will take each commit from your feature branch and re-apply them on top of the latest commit in the main branch. If there are no conflicts, the process completes instantly, and your branch is now up-to-date.

If conflicts arise, Git will pause the rebase process and ask you to resolve them manually. Open the conflicting files, edit the code to resolve the discrepancies, and then save the files. Once resolved, stage the changes with git add . and continue the rebase process by running git rebase --continue. Repeat this process for each conflicting commit until the rebase is complete. You can verify the new history using git log --oneline.

Essential Tips for Success

Always create a backup branch before performing an interactive rebase or a complex rebase operation. Use git branch backup-feature to create a snapshot. This allows you to revert to the original state if something goes wrong. If you make a mistake during the rebase process, you can abort it completely by running git rebase --abort, which restores the branch to its state before the rebase started. Remember that you should never rebase commits that have been pushed to a shared remote repository. If you must change history on a shared branch, use git push --force-with-lease, but only after coordinating with your team members to avoid overwriting others’ work. Finally, consider using git pull --rebase instead of the standard git pull to automatically rebase your local commits onto the upstream branch when pulling updates, keeping your local history clean and linear.

FAQ

Q: What is the difference between git merge and git rebase?
A: Merge creates a new commit combining two histories, preserving the original branch structure, while rebase moves commits to a new base, resulting in a linear history without extra merge commits.

Q: Can I rebase after I have pushed my commits to a remote repository?
A: You can, but it is highly discouraged for shared branches because it rewrites history. You must force push, which can overwrite changes made by other developers, so it is best to avoid this practice on public branches.

Q: How do I stop a