遇到的一些坑：

1. 脚本权限问题git update-index --chmod=+x build.sh
2. 文件冲突，注意先后顺序git merge test(Merge made by the 'ort' strategy.)
3. ssh-keygen git@github.com: Permission denied (publickey).fatal: Could not read from remote repository.

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$ git checkout -b test

# 模拟如下修改
$ echo '模拟修改提交' >> README.md

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$ git add .
$ git commit -m 'test'
$ git push --set-upstream origin test

关于git的常用操作

参考：

1. How to start open course
   https://eryajf.github.io/HowToStartOpenSource

2. Git远程操作详解
   http://www.ruanyifeng.com/blog/2014/06/git_remote.html

3. zju-icicles
   https://qsctech.github.io/zju-icicles/