删除远程分支命令：
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$ git push origin :br03
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或者：
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$ git push origin --delete br03
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另一个用户使用git fetch并不能同步获取到br03分支被删除。
此命令没有更新的显示，说明并无删除的信息。
但执行git pull时，报错。
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$ git pull
Your configuration specifies to merge with the ref 'br03'
from the remote, but no such ref was fetched.
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这肯定是执行git fetch时，报错。
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$ git fetch origin br03
fatal: Couldn't find remote ref br03
fatal: The remote end hung up unexpectedly
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但检查分支时，发现origin/br03还存在。
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$ git br -a
br01
br02
* br03
master
remotes/origin/br01-remote
remotes/origin/br03
remotes/origin/master
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这说明，remotes/origin/*这些远程跟踪分支，仅仅是远程分支的一个缓存，并且，不能通过git fetch命令获取到分支删除的更新。
执行命令
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$ git remote show origin
* remote origin
Fetch URL: git@github0123:jeremy0123/fetch.git
Push URL: git@github0123:jeremy0123/fetch.git
HEAD branch: master
Remote branches:
br01-remote tracked
br02 tracked
br03-remote tracked
master tracked
refs/remotes/origin/br03 stale (use 'git remote prune' to remove)
Local branches configured for 'git pull':
br01 merges with remote br01-remote
br03 merges with remote br03
master merges with remote master
Local refs configured for 'git push':
br02 pushes to br02 (up to date)
master pushes to master (local out of date)
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发现refs/remotes/origin/br03状态是stale(陈旧的)，并且后面有命令提示。
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$ git remote prune origin
Pruning origin
URL: git@github0123:jeremy0123/fetch.git
* [pruned] origin/br03
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或者执行
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$ git fetch -p
remote: Counting objects: 5, done.
remote: Total 3 (delta 0), reused 0 (delta 0)
Unpacking objects: 100% (3/3), done.
From git@github0123:jeremy0123/fetch.git
04a6837..d49d143 master -> origin/master
x [deleted] (none) -> origin/br03
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在执行fetch之后，删除远程不存在的远程跟踪分支。
~~ EOF ~~
