In Git, how do you apply a commit of bug fix to the other newer branches?

Question

If I have a public Git repository that contains 3 branches like the following:

  (release-to-customerA)
      |
      U               (master)
     /                 


        

Answer 1

You don't need to rebase for this particular operation, cherry-picking is fine:

git checkout release-to-customerB
git cherry-pick U
git checkout master
git cherry-pick U

Cherry-picking only creates new commits and does not rewrite history, so it's always safe even if you later push to another repository.