<pre><code>RUN HOST_IP=$(route -n | awk '/UG[ \t]/{print $2}') && new_line="${HOST_IP} link-host" && echo $new_line >> /etc/hosts
<pre><code>RUN HOST_IP=$(route -n | awk '/UG[ \t]/{print $2}') && new_line="${HOST_IP} link-host" && echo $new_line >> /etc/hosts