可能不常用到的Git命令
####统计代码行数
git ls-files | xargs wc -l
####统计python代码行数
git ls-files | grep .py | xargs wc -l
####更新fork项目:
如果你fork了别人的项目，过段时间突然发现该项目更新了很多内容，于是你想同步更新到自己的仓库中，可以按如下步骤：
1. 添加一个remote指向上游仓库git remote add upstream https://github.com/keleshev/schema.git
2. 获取上游远程分支更新内容git fetch upstream
3. 合并到本地分支git checkout mastergit merge upstream/master
####删除远程分支
git push origin --delete branch-a # 删除远程分支branch-a
如果远程分支已经删除,但是本地还存在诸如:remotes/origin/[branch]这样的分支时，可能会引起错误:
error: unable to delete ‘lzjun’: remote ref does not exist
error: failed to push some refs to ‘git@bitbucket.org:sponialtd/openplay_pylibs.git’
解决办法是参考地址：
git fetch -p origin
####不再同步某些已经加入仓库的文件
有时候忘记添加.gitignore文件，而误把一些pyc文件同步到了仓库中，此时你希望不再同步这些文件，使用：
git update-index --assume-unchanged path/to/file
如果现在你又想把它加入到仓库中，怎么办？使用：
git update-index --no-assume-unchanged path/to/file
也可以使用命令：
git reset --cached [file]
停止追踪文件，但不会删除，也就是说只从暂存区移除。
####删除一次commit
由于某些原因导致误操作增加了一次commit，现在想删除它，怎么办？
git logcommit 663019f323084a7ebdab0aa96223272816d64322
Author: liuzhijun <lzjun567@gmail.com>
Date: Thu Aug 27 12:25:12 2015 +0800Remove TODOcommit 0d6aa254961945372d3108ab053b51426194cbaf
Author: liuzhijun <lzjun567@gmail.com>
Date: Thu Aug 27 12:22:59 2015 +0800Remove TODO
我要删除6630这个commit
git reset --hard [commit]
git push origin HEAD --force
git push 到远程分支的时候报莫名其妙的错误：
git push origin feature/3.1Counting objects: 8, done.
Delta compression using up to 4 threads.
Compressing objects: 100% (7/7), done.
Writing objects: 100% (8/8), 652 bytes | 0 bytes/s, done.
Total 8 (delta 6), reused 3 (delta 1)
remote: error: cannot lock ref 'refs/heads/feature/3.1': Unable to create '/ndiskd/repositories/li/liuzhijun/beiy unbao.git/refs/heads/feature/3.1.lock': File exists.
remote:
remote: If no other git process is currently running, this probably means a
remote: git process crashed in this repository earlier. Make sure no other git
remote: process is running and remove the file manually to continue.
To git@git.oschina.net:liuzhijun/xxx.git! [remote rejected] feature/3.1 -> feature/3.1 (failed to update ref)
解决办法是把远程分支删除，再添加进来
$ git remote -v
origin git@git.oschina.net:liuzhijun/xxx.git (fetch)
origin git@git.oschina.net:liuzhijun/xxx.git (push)$ git remote rm origin$ git remote add origin git@git.oschina.net:liuzhijun/xxx.git
