git

Warning: LF will be replaced by CRLF

git config --global core.autocrlf false

SSH配置问题

清空.ssh文件夹后重新生成known_hosts文件：
```
ssh-keyscan -t rsa github.com >> .ssh/known_hosts
ssh-keygen -H
rm .ssh/known_hosts.old
```
第二个命令ssh-keygen -H将host名从明文变为哈希字串

清除历史提交记录

Checkout
```
git checkout --orphan latest_branch
```
Add all the files
```
git add -A
```
Commit the changes
```
git commit -am "commit message"
```
Delete the branch
```
git branch -D master
```
Rename the current branch to master
```
git branch -m master
```
Finally, force update your repository
```
git push -f origin master
```