Get information about and control usb hid relay devices
usbrelay envvar=[0|1]...
usbrelay without parameters shows information about found USB HID relay devices.
usbrelay with specified environment variables switches relays on or off.
/usr/share/doc/usbrelay/README.md.gz
This man page was written by Jan Dittberner <[email protected]> for Debian systems (but may be used by others).