To create a local repository
git init
to clone an repository from remote server
git clone
list changed files in your working directory
git status
List changed to traked files
git diff
Add all current changed in file to the next commit
git add
Add all current changed to the next commit
git add .
Delete file and add its deletion to next commit
git rm
Commit all local changes in tracked files
git commit -a
Download all changes from remote, but don't merge into HEAD
从远程库更新所有的信息到本地，但是不合并
git fetch <remote>
Download changes and directly merge into HEAD
从远程库更新数据并立即合并数据
git pull <remote><branch>
Publish local changes on a remote
git push <remote><branch>
Show information about a submodule
显示远程库信息
git remote show <remote>
Discarding local changes
回退到某个版本
git rest --hard <commit> 回退到某个版本并保存未追踪的改动 git reset `
回退到某个版本并保存未提交的改动
git reset --keep <commit>