1.echo 1 > /mytest/boot_times
2.systemctl enable i2c_dmesg.service
root:/mytest# tree . |-- boot_times |-- i2c_dmesg.txt
root:/etc# cat i2c_dmesg.sh
#!/bin/sh
value=$(cat /mytest/boot_times)
# Keep dmesg file the same as console log
echo "========sfl: reboot=$value========" >> /mytest/i2c_dmesg.txt
/bin/dmesg >> /mytest/i2c_dmesg.txt
echo "========sfl: reboot=$value========" > /dev/console
let value=value+1
echo $value > /mytest/boot_times
sync
sync
root:/etc# cat /lib/systemd/system/i2c_dmesg.service [Unit] Description=dmesg for i2c oops After=weston.service [Service] ExecStart=/etc/i2c_dmesg.sh Type=simple [Install] WantedBy=multi-user.target
本文参考链接：https://www.cnblogs.com/hellokitty2/p/9735166.html
