进入/etc/systemd/system/目录，创建myscript.service，并赋予权限
sudo vim /etc/systemd/system/myscript.service
Unit
Description=My Script Service
After=network.target
Service
User=root
ExecStart=/home/start.sh
Restart=always
Install
【其中User是开发板的用户名，米尔为root，
否则查看运行状态显示 myscript.service: Failed to determine user credentials: No such process
ExecStart是执行脚本，使用绝对路径表示】
输入一下指令：
sudo systemctl daemon-reload
sudo systemctl start myscript.service
sudo systemctl enable myscript.service
重启开发板后查看服务开启状态
sudo systemctl status myscript.service
关闭自启动服务
sudo systemctl stop myscript.service
sudo systemctl disable myscript.service