connect-to-ethernetis a systemd service that automatically connects the Beaglebone Black to a wired LAN. It runs at boot and continually attempts to connect to the currently network until it successfully acquires a DHCP lease.
Run install.sh with bash.
See the systemd man pages for information on writing various parts of the service file. Descriptions for relevant sections are on separate pages (e.g. configuration of the [Unit] section is on the systemd.unit page.