git技巧：删除在本地有但在远程库中已经不存在的分支

上篇 讲到用

$ git remote show origin

可以查看远程库的一些信息，及与本地分支的信息。有时候可能遇到如下情况

$ git remote show origin

* remote origin
Fetch URL: ... .git
Push  URL: ... .git
HEAD branch: master
Remote branches:
dev                     tracked
jqmobi                  tracked
master                  tracked
refs/remotes/origin/3.1 stale (use 'git remote prune' to remove)
refs/remotes/origin/tc  stale (use 'git remote prune' to remove)
refs/remotes/origin/xhl stale (use 'git remote prune' to remove)
Local branches configured for 'git pull':
dev    merges with remote dev
master merges with remote master
Local refs configured for 'git push':
dev    pushes to dev    (up to date)
jqmobi pushes to jqmobi (up to date)
master pushes to master (up to date)

其中3.1, tc, xhl三个分支在远程库已经不存在了（你之前从远程库拉取过，可能之后被其他人删除了，你用 git branch -a 也是不能看出它们是否已被删除的），这时候我们可以删除本地库中这些相比较远程库中已经不存在的分支：

$ git remote prune origin
Password for '...':
Pruning origin
URL: ... .git
* [pruned] origin/3.1
* [pruned] origin/tc
* [pruned] origin/xhl