Mein Arch Linux & Co.

/home/walter/$ sudo my-lan-on-off.sh

---INFO---- RC: 0 Routingtabelle:
Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
default         fritz.box       0.0.0.0         UG    0      0        0 enp2s0
192.168.180.0   *               255.255.255.0   U     0      0        0 enp2s0

---INFO---- RC: 0 Ende route.
---INFO---- RC: 0 checking interface: eth0
---INFO---- RC: 0 checking interface: enp2s0
---INFO---- RC: 0 found... interface: enp2s0

Parameter:  on
            off
     oder   x = Abbruch
Parameter: off
---INFO---- RC: 0 -----------------------------------
---INFO---- RC: 0 route delete ...
---INFO---- RC: 0 enp2s0 IP: 192.168.180.100 down ...
---INFO---- RC: 0 -----------------------------------