Setup network configuration on Gentoo Linux

setup.sh

#!/bin/bash

set -e

DO_SETUP=false

function read_yes_or_no(){
echo -n "${1} [y/N] "
read YES_OR_NO
case ${YES_OR_NO^^} in
  YES|Y )
    DO_SETUP=true
    ;;
  ""|NO|N )
    # do nothing
    ;;
  * )
    read_yes_or_no "${1}"
    ;;
esac
}

function suicide(){
SELF="$(readlink -f ${0})"
sed -i "\!${SELF}!d" /etc/inittab
rm -f "${SELF}" || true
}

if [ 'localhost' != "$(hostname)" ]; then
  suicide
  exit 0
fi

read_yes_or_no "Do you want initialize and setting up network configurations?"
if ${DO_SETUP}; then
  echo -n "Please input hostname > "
  read host_name
  echo -n "Please input eth1 IP Addr and Subnet mask (e.g. \"0.0.0.0/24\") > "
  read eth1_ipaddr
  echo -n "Please input eth1 Default Gateway > "
  read eth1_route

cat<<EOI>/etc/conf.d/hostname
hostname="${host_name}"
EOI

cat<<EOI>/etc/conf.d/net.eth1
config_eth1="${eth1_ipaddr}"
routes_eth1="default via ${eth1_route}"
dns_servers_eth1="172.16.0.1 172.16.0.2"
EOI

  test -x /etc/init.d/net.eth1 && /etc/init.d/net.eth1 restart || true
  suicide
fi

exit 0

[root@localhost] # tail -1 /etc/inittab
cfnw::bootwait:/etc/setup.sh