static-ip

#!/bin/bash

# Example invocation
# IF=enp0s25 IP=192.168.1.3 MASK_CIDR=24 BCAST=192.168.1.255 GATEWAY=192.168.1.1 DNS_IP=8.8.8.8 ./static-ip

function die {
  echo "$0 Error: $1"
  exit 1
}

test "${IF}" || die 'Define IF'
test "${IP}" || die 'Define IP'
test "${MASK_CIDR}" || die 'Define MASK_CIDR'
test "${BCAST}" || die 'Define BCAST'
test "${GATEWAY}" || die 'Define GATEWAY'
test "${DNS_IP}" || die 'Define DNS_IP'

sudo systemctl stop "dhcpcd@${IF}"
old_ip="$(ip addr show "${IF}" | grep -w inet | awk '{print $2}')"
if [[ -n "${old_ip}" ]]; then
  sudo ip addr del "${old_ip}" dev "${IF}"
fi

sudo ip link set "${IF}" up
sudo ip addr add "${IP}/${MASK_CIDR}" broadcast "${BCAST}" dev "${IF}"
sudo ip route add default via "${GATEWAY}"
sudo resolvconf -a "${IF}" <<<"nameserver ${DNS_IP}"