auto generate issue for centos6

autoissue

#!/bin/bash
#
### BEGIN INIT INFO
# Required-Start: $network
# Should-Start: $network
# Default-Start: 2 3 4 5
# Default-Stop: 0 1 6
### END INIT INFO
#
# chkconfig: 2345 98 02
# description: autoissue
#

. /etc/init.d/functions

function err()
{
  echo "command notfound $1" 1>&2
  exit 1
}

function has()
{
  type "$1" 1> /dev/null 2>&1
}

[ "$EUID" -eq 0 ] || err "this script is root only"

has ip   || err "ip command notfound"
has perl || err "perl command notfound"

if has banner; then

  function print_banner() {
    banner " $1.$2" "  $3.$4"
  }

elif has figlet; then

  function print_banner() {
    figlet -f banner " $1 . $2"$'\n'"   . $3 . $4"
  }

else
  err "banner or figlet command notfound"
fi

function start() {
  sed -i -ne '/^===*/q;p' /etc/issue

  {
    echo '==='
    print_banner $(
      ip -o route get 255.255.255.255 |
        perl -nle 'print "$1 $2 $3 $4" if /\s+src\s+(\d+)\.(\d+)\.(\d+)\.(\d+)/'
    )
  } >> /etc/issue

  echo -n "Auto issue generate"
  success
  echo

  #pkill agetty   1>/dev/null 2>&1
  #pkill mingetty 1>/dev/null 2>&1
}

function stop() {
  sed -i -ne '/^===*/q;p' /etc/issue

  echo -n "Auto issue restore"
  success
  echo
}

case "$1" in
  start)
    start
    ;;

  stop)
    stop
    ;;

  status)
    ;;

  *)
    echo $"Usage: $0 {start|stop|status}"
    exit 2
esac

exit 0