简书链接:linux中让一个sh脚本开机运行通过编写service实现。
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模仿开源源码写了一个mjpgstream-service.service发现可以用，第一次因为资源busy不得不重启释放资源了。
主要是想让我的设备开机启动就跑摄像头流，这样就可以进行相机查看。
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| [Unit]
Description=mjpg-streamer Daemon
Documentation=https://github.com/jacksonliam/mjpg-streamer
After=network.target network-online.target
Wants=network-online.target
Requires=network.target
[Service]
Type=notify
User=daemon
Group=daemon
WorkingDirectory=/opt/mjpg-streamer/mjpg-streamer-experimental/
ExecStart=/opt/mjpg-streamer/mjpg-streamer-experimental/start.sh
StandardOutput=null
StandardError=journal
Environment=PYTHONUNBUFFERED=1
Restart=always
RestartSec=3
[Install]
WantedBy=multi-user.target
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然后创建快捷方式到systemd
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sudo ln -s /opt/startup/mjpgstream-service.service /etc/systemd/system/mjpgstream-service.service
sudo systemctl daemon-reload
# tell system that it can start our script at system startup during boot
sudo systemctl enable mjpgstream-service.service
# start the script running
sudo systemctl start mjpgstream-service.service
# check to make sure all is ok with the start up
sudo systemctl status mjpgstream-service.service
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干掉服务
，其实等同于删掉 /etc/systemd/system/mjpgstream-service.service
输入
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| sudo systemctl unmask mjpgstream-service.service
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如果启动提示service is masked
可能因为里面的内容不正确，我第一次是因为是空的。
查看错误
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| sudo journalctl -u robotcar.service -e
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权限不够问题 i2c
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| sudo usermod -aG i2c daemon
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或者提升root组
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