Hackish sed scripts to change network interfaces from DHCP to Static IP on a CubieTruck

switch_network.sh

#!/bin/bash

# SETUP:
#   * Replace '#iface eth0 inet<some-char>dhcp' with '# iface eth0 inet dhcp'

net="${1}"

function usage() {
  echo "USAGE: ${0} (dhcp|static)"
  echo
}

function to_static() {

  sed -i'' \
      -e 's;^# \(iface eth0 inet static\);\1;' \
      -e 's;^# \(address 192\.168\.1\);\1;' \
      -e 's;^# \(netmask 255.255.255.0\);\1;' \
      -e 's;^# \(network 192.168.1.0\);\1;' \
      -e 's;^# \(broadcast 192.168.1.255\);\1;' \
      -e 's;^\(iface eth0 inet dhcp\);# \1;' /etc/network/interfaces
  echo "Changed eth0 to static IP"
}

function to_dhcp() {

  sed -i'' \
      -e 's;^\(iface eth0 inet static\);# \1;' \
      -e 's;^\(address 192\.168\.1\);# \1;' \
      -e 's;^\(netmask 255.255.255.0\);# \1;' \
      -e 's;^\(network 192.168.1.0\);# \1;' \
      -e 's;^\(broadcast 192.168.1.255\);# \1;' \
      -e 's;^# \(iface eth0 inet dhcp\);\1;' /etc/network/interfaces
  echo "Changed eth0 to DHCP"
}

if [ "x" == "x${net}" ]; then
  usage
  exit 0
fi

if [ "dhcp" == "${net}" ]; then
  to_dhcp
else
  to_static
fi

exit 0