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git bisect

Uses binary search to find the commit that introduced a bug.

Syntax

git bisect <subcommand>

Options

start: Begins the bisect session
bad [<rev>]: Marks a commit as containing the bug
good [<rev>]: Marks a commit as not containing the bug
reset: Ends the bisect session and returns to the original branch
skip: Skips the current commit if it cannot be tested
log: Shows what has been done so far
run <cmd>: Automates bisect by running a script for each step

Example

git bisect start
git bisect bad
git bisect good v1.0.0
# Git checks out a commit to test
git bisect good  # or: git bisect bad
git bisect reset

Tip

Automate bisecting with git bisect run <test-script> to find bugs without manual testing.