Script ubuntu carte internet

while true;
do

if ping -c 1 google.com > /dev/null
then
echo "tout va bien"
else
echo "redémarrage du service..."
service networking restart
fi
sleep 5s
done

echo "debut script"
sudo rien

while true;do
echo "debut test"
if [ -n "$(ping -c 1 www.google.fr|grep rtt)" ]
then
echo "connection etablie"
else
echo "pas de connection"
sudo ifconfig enp8s8 down
sleep 2
sudo ifconfig enp8s8 up
echo "problemme réglé"
fi
sleep 30
echo "fin test"
done

sudo rien

while true;do
...
...
...
done

if [ -n "$(ping -c 1 www.google.fr|grep rtt)" ]
then
...
else
...
fi

ati14@ati14-Presario-C500-GF851EA-ABF:~$ ping -c 1 www.google.fr
PING www.google.fr (216.58.213.131) 56(84) bytes of data.
64 bytes from par21s03-in-f3.1e100.net (216.58.213.131): icmp_seq=1 ttl=55 time=174 ms

--- www.google.fr ping statistics ---
1 packets transmitted, 1 received, 0% packet loss, time 0ms
rtt min/avg/max/mdev = 174.476/174.476/174.476/0.000 ms


ati14@ati14-Presario-C500-GF851EA-ABF:~$ ping -c 1 192.168.0.0
PING 192.168.0.0 (192.168.0.0) 56(84) bytes of data.
From 192.168.1.254 icmp_seq=1 Destination Host Unreachable

--- 192.168.0.0 ping statistics ---
1 packets transmitted, 0 received, +1 errors, 100% packet loss, time 0ms 

sudo ifconfig enp8s8 down
sleep 2
sudo ifconfig enp8s8 up