Share your WiFi connection with other devices, using an Ethernet cable
This is useful for when you only have one WiFi adapter, but you want multiple devices to use that one internet connection, without buying any additional hardware.
With this script, I'm using a Raspberry Pi's built-in ethernet port to share its internet connection to other downstream devices.

To connect multiple devices downstream, use an ethernet switch.

To run: Menu -> System Tools -> Ethernet Hotspot
To run in a terminal: sudo ethernet-hotspot
