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snippets/git/s/manual-find-commit-with-bug.md

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+---
+title: Manually find the commit that introduced a bug
+type: snippet
+language: git
+tags: [commit,branch]
+author: chalarangelo
+cover: blue-computer
+dateModified: 2021-04-13T21:10:59+03:00
+---
+
+Uses a binary search algorithm to manually find which commit in history introduced a bug.
+
+- Use `git bisect start` to start the process.
+- Use `git bisect good <commit>` to mark a `<commit>` as "good", indicating it is known to be bug-free.
+- Use `git bisect bad <commit>` to mark a different `<commit>` as "bad" indicating it has the bug.
+- Use `git bisect (bad | good)` marking each subsequent commit as "good" or "bad" depending if it has the bug or not.
+- Use `git bisect reset` to reset to the original branch. You can optionally specify a `<commit>` to reset to.
+
+```shell
+git bisect start
+git bisect good <commit>
+git bisect bad <commit>
+git bisect (bad | good)
+git bisect reset [<commit>]
+```
+
+```shell
+git bisect start
+git bisect good 3050fc0de
+git bisect bad c191f90c7
+git bisect good # Current commit is good
+git bisect bad # Current commit is buggy
+# ... some time later the bad commit will be printed
+git bisect reset # Goes to the original branch
+```