What is git rebase

Overview

Git rebase is a Git command that reapplies a series of commits from one branch on top of another branch. Unlike merging, which combines branch histories, rebasing replays your commits onto a different base, creating a linear and cleaner project history.

How Git Rebase Works

When you run git rebase, Git performs the following steps: First, it identifies the commits that exist in your current branch but not in the target branch. Second, it temporarily stores these commits. Third, it updates your current branch to match the target branch. Finally, it reapplies your stored commits on top of the new base, one by one. If conflicts occur during reapplication, you must resolve them before continuing.

Rebase vs. Merge

The key difference between rebase and merge lies in how they integrate changes. Merging creates a new merge commit that ties two branch histories together, resulting in a more complex, non-linear history. Rebasing rewrites history to maintain a straight, linear progression of commits. Rebase produces cleaner history but rewrites commits, while merge preserves the complete history of both branches.

Interactive Rebase

Interactive rebase (git rebase -i) allows you to modify commits during the rebasing process. You can reorder commits, squash multiple commits into one, edit commit messages, or drop commits entirely. This is particularly useful for cleaning up your commit history before submitting a pull request, consolidating multiple small fixes into logical commits, or removing accidentally committed sensitive information.

Best Practices and Cautions

Never rebase commits that have been pushed to public branches or shared repositories, as it rewrites history and causes conflicts for other developers. Only rebase local branches or feature branches that you haven't shared. Always communicate with team members before rebasing shared work. Use rebase for local cleanup and history improvement, but prefer merge for integrating changes in shared repositories to maintain a clear, preserved history.