USB Power shutdown method? And Hard drives?

Single Board Computers Odroid N2/N2Plus/C4
18

shutdown.sh bash script is called on shutdown: https://wiki.libreelec.tv/autostart.sh
It should be easy to write a script to unmount all devices mounted under /media.

For a start: https://stackoverflow.com/questions/19751624/how-to-unmount-all-usb-pen-drive-from-ubuntu-with-bash-script-or-terminal

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