先拉取old_branch最新代码到本地

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git checkout old_branch

git pull origin old_branch

本地修改后并推送

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# 修改分支名称
git branch -m old_branch new_branch 

# 删除在远程的老分支
git push --delete origin old_branch

推送新分支

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git push origin new_branch

本地分支与远程分支相连

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git branch --set-upstream-to origin/new_branch