git process crashed in this repository earlier

源：http://blog.csdn.net/wh_19910525/article/details/8161365
评：
1.今天 当我  执行  git add  somefile 的时候，出现 如下 错误：

If no other git process is currently running, this probably means a
git process crashed in this repository earlier. Make sure no other git
process is running and remove the file manually to continue.

解决方法：

rm -f ./.git/index.lock