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rename a local branch - must be currently in the branch to rename
git branch -m new-name -
Delete the old-name remote branch and push the new-name local branch.
git push origin :old-name new-name -
Reset the upstream branch for the new-name local branch. - switch to the branch
git push origin -u new-name
shortcut
git branch -m old_branch new_branch # Rename branch locally
git push origin :old_branch # Delete the old branch
git push --set-upstream origin new_branch # Push the new branch, set local branch to track the new remote