https://segmentfault.com/a/1190000008280278#articleHeader3
https://wiki.archlinux.org/index.php/I3
http://ju.outofmemory.cn/entry/222760
https://blog.csdn.net/k_y_z_s/article/details/79363852

  1. 修改亮度
    echo 35 | sudo tee /sys/class/backlight/intel_backlight/brightness&>/dev/null