开始接受命令行的毒打（指偷懒没学Linux然后现在上操作系统课直接被老师要求用Linux实验）
Why is this step necessary? hello.2heng.xin might not be the server where you are registered, so we need to redirect you to your home server first. Don't have an account? You can sign up here
hello.2heng.xin
