Manipulating PC power button via CH340 relay module. See also: https://github.com/andrewintw/usb-powered-relay
(in root privilege)
# ./ohayo.sh --device /dev/ttyUSB0 on
# ./ohayo.sh --device /dev/ttyUSB0 kill
on for short, kill for long press.
Copyright Hajime Suzuki (2020), MIT