git merge-base
SafeFind the common ancestor
git merge-base <a> <b>
Finds where two branches diverged — scope diffs to 'changes since the fork' precisely.
Examples
git diff $(git merge-base main feature)..featureDiff only post-fork changes
Syntax
git merge-base <branch1> <branch2>
Before you run it
Read only.
The same reference, with no signal at all
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