temp.sh

#!/bin/bash
set -e

IFACE=enp2s0
ADDR=192.168.1.69/24

echo "Temporarily setting $IFACE to $ADDR"

sudo nmcli dev disconnect "$IFACE" 2>/dev/null || true
sudo dhclient -r "$IFACE" 2>/dev/null || true

sudo ip link set "$IFACE" down
sudo ip addr flush dev "$IFACE"
sudo ip link set "$IFACE" up
sudo ip addr add "$ADDR" dev "$IFACE"
ip -4 addr show dev "$IFACE"
sleep 1
ip route show dev "$IFACE"
: <<'END_COMMENT'
#!/bin/bash
#set -e
end:<<
IFACE=enp2s0

echo "Temporarily setting Ethernet to 192.168.1.10"

sudo dhclient -r "$IFACE" || true
sudo ip addr flush dev "$IFACE"
sudo ip link set "$IFACE" up
sudo ip addr add 192.168.1.10/24 dev "$IFACE"

ip -4 addr show dev "$IFACE"
ip -4 addr show dev "$IFACE"
END_COMMENT