#!/bin/sh
# Author: Tim van Erven <tve@vormig.net>
# Version: 1.0

# Options

HOST='localhost'  # Change this to a remote host near you
TIMEOUT=2
WAIT=1
PING=`which ping`
DATE=`which date`

# Don't change anything below this line

IPHOST=`host $HOST | awk '{print $3;}'`
UP=false
echo -n "Starting monitor at:\t"
$DATE
trap 'echo -n "Stopping monitor at:\t"; $DATE; exit 0' 2 9

while true; do
  $PING -q -W $TIMEOUT -c1 "$IPHOST" > /dev/null 2> /dev/null
  if [ $? -eq 0 ]; then
    if [ $UP = false ]; then
      echo -n "$HOST up:\t"
      $DATE
      UP=true
    fi
  else
    if [ $UP = true ]; then
      echo -n "$HOST down:\t"
      $DATE
      UP=false
    fi
  fi
  sleep $WAIT
done