Set static address to interface :
sudo ip address add 10.0.0.1/24 dev eth0
Remove static address from interface :
sudo ip address del 10.0.0.1 dev enp4s0
Add static route :
sudo ip route add 10.10.3.0/24 dev en0sp3
Also :
sudo ip route add 10.10.3.0/24 via 10.10.1.10 dev en0sp3
Delete route :
sudo ip route delete 10.10.3.0//24 dev en0sp3