Fine for now, but perhaps worth overloading CommonCommands.chain to take `(String... commands)`, and then doing:

    script.add(CommonCommands.chain(
            sudo("service iptables status > /dev/null"),
            sudo("iptables -F"),
            sudo("iptables -A INPUT -i eth0 -p tcp -m tcp --dport 3306 -j ACCEPT")));