Sans nom

echo "$(sed "s/IP/${IP}/g" /usr/local/sbin/newinterface.conf)" ;
echo "$(sed "s/SUB/${SUB}/g" /usr/local/sbin/newinterface.conf)" ;
echo "$(sed "s/GATE/${GATE}/g" /usr/local/sbin/newinterface.conf)" > /etc/network/interfaces ;