1. 切换到被copy的分支(master),并且从远端拉取最新版本

$ git checkout master
$ git pull

2.从当前分支拉copy开发分支

$ git checkout -b dev
Switched to a new branch 'dev'

3.把新建的分支push到远端

$ git push origin dev

4.拉取远端分支

由于当前的分支并没有和本地分支关联,根据提示进行关联

$ git pull
There is no tracking information for the current branch.
Please specify which branch you want to merge with.
See git-pull(1) for details.

    git pull <remote> <branch>

If you wish to set tracking information for this branch you can do so with:

    git branch --set-upstream-to=origin/<branch> dev

5.关联

$ git branch --set-upstream-to=origin/dev

6. 再次拉取

$ git pull
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