Manjaro set static IP Address

static-interface-arch-linux

# install netctl
sudo pacman -S netctl --noconfirm

# check network card name
ip link

### Config Static IP Address ###
# Card Name : eth0
sudo cp /etc/netctl/examples/ethernet-static /etc/netctl/eth0

sed -i "s/Address=(*.*)/Address=(\'192.168.50.100\/24\')/g" /etc/netctl/eth0
sed -i "s/Gateway='*.*/Gateway='192.168.50.1'/g" /etc/netctl/eth0
sed -i "s/DNS='*.*/DNS='192.168.50.1'/g" /etc/netctl/eth0

# replace eth0 with your actual network interface name. eth0
# also chnage DNS to this DNS=('8.8.8.8' '8.8.4.4')

sudo netctl enable eth0
sudo netctl start eth0

# also you have to disable dhcp
sudo systemctl stop dhcpcd
sudo systemctl disable dhcpcd