for intf in $(ls /sys/class/net) ; do
if [ -d /sys/class/net/$intf/device ] &&
[ "$(route --inet --inet6 | grep default | grep $intf)" == "" ] ; then
for intf in $(ls /sys/class/net) ; do
if [ -d /sys/class/net/$intf/device ] &&
[ "$(route --inet --inet6 | grep default | grep $intf)" == "" ] ; then