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Merge and rebase can leave your files in the same final state but record different histories. A fast-forward merge moves a branch pointer, a true merge creates a commit connecting divergent lines of work, and a rebase replays commits on a new base—creating rewritten commits. The right choice depends on whether you want to preserve the branch junction, prefer a linear log, and have already shared the commits.
What changes: the files, the commit graph, or both?
A Git commit records a snapshot and its position in the commit history. Branch names point to commits. Integrating work can therefore affect the files, the graph of commit relationships, and the branch pointer in different ways.
Merge and rebase may produce the same final file snapshot even though their commit graphs differ. A merge can preserve a visible junction between branches; a rebase usually produces a linear-looking sequence by replaying work onto a different base. To see the difference, inspect the ancestry—not just the files or the latest commit.
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What a merge does to history
Fast-forward merge: move the branch pointer
If the branch being merged is already ahead of the current branch with no diverging commits, Git can fast-forward: it advances the current branch pointer to the incoming tip. This creates no merge commit and records no separate junction. The Git merge manual describes fast-forwarding as updating the branch pointer to match the merged branch.
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True merge: record the point where histories meet
If the branches have diverged, a true merge combines their changes and records a merge commit with both histories represented as parents. That commit makes the integration point part of the graph. If retaining a merge commit is important even when fast-forwarding is possible, Git’s --no-ff option prevents a fast-forward; check the documentation for your installed Git version before relying on option details.
A merge can pause if Git cannot reconcile conflicting changes automatically. Resolve the conflicts and continue, or abort the merge using the documented workflow for your Git version.
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What a rebase does to history
Rebase takes commits from the working branch and replays their changes on top of a chosen base. The resulting commits belong to a new sequence: replaying a change on a different parent creates a different commit, rather than moving the original commit unchanged. The old and new commits may represent equivalent changes, but they have different ancestry.
This usually makes the branch appear as a straight line in a log. During replay, Git may stop if a change cannot be applied cleanly; the rebase workflow lets you resolve the conflict and continue, or skip or abort as appropriate. See the Git rebase manual for the command behavior and recovery options that apply to your version.
Why identical files can have different histories
The final commit after a rebase and the final merge commit can point to the same file snapshot, while the commits leading to that snapshot differ. Pro Git explains this distinction in its chapter on rebasing: the content can match even though the history does not.
That is why a clean-looking diff or identical files do not establish that two branches have the same ancestry. A merge graph can show where branch work joined; a rebased graph commonly shows the work as a linear sequence. The distinction matters when reading history, reviewing how work was integrated, or coordinating changes with others.
How to choose between merge and rebase
| Question | Merge | Rebase |
|---|---|---|
| Should the log show an explicit integration point? | A true merge records a merge commit with both parent histories. A fast-forward does not create that commit unless fast-forwarding is prevented. | Replayed commits form a new sequence on the chosen base rather than preserving the original branch junction. |
| Is a linear-looking history the goal? | A true merge retains the branch junction in the graph. | Usually produces a linear-looking sequence by replaying the branch commits. |
| Have the commits already been shared? | Does not require rewriting the existing commits on the branch being merged. | Rewrites the replayed commits; rewriting published history can disrupt collaborators who fetched or built on it. |
A practical workflow is to rebase private, local work when a linear history is useful, and to use merge when preserving explicit integration topology matters. Avoid rebasing commits others may already depend on unless the people affected agree on the rewrite. This is a workflow choice, not a universal Git rule.
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Either operation can require manual conflict resolution. Merge has documented continue and abort workflows; rebase can pause while replaying a commit that does not apply cleanly. Before integrating, protect uncommitted work by committing it or otherwise ensuring it is safe. Then follow the relevant merge or rebase manual for your installed Git version.
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Why rebasing shared commits needs coordination
Because rebase replaces commits with rewritten ones, collaborators may have histories based on commits that no longer appear in your branch’s new sequence. The Git pull documentation warns that rewriting history after it has been published can be dangerous. Coordinate before rewriting shared work; do not assume that a matching final file snapshot means other contributors can safely adopt the rewritten history.
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