[Solved] restart function doesn't work

[LogicParrot]

I can confirm this happens to me as well. Apparently, restart is not properly supported. It is not your fault.

In the meantime, I suggest you put Cuberite inside some wrapper script which restarts it whenever it exits:

Save this as wrapper.sh:

#!/bin/sh
while [ 1 -eq 1 ]; do
    ./cuberite
    echo "Restarting Cuberite in 10 seconds..."
    sleep 10
done

To start cuberite:

chmod +x wrapper.sh
./wrapper.sh