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#!/bin/bash
	# Packets Loss Watch
	# Simple SHELL script for Linux and UNIX system monitoring with
	# ping command
	#
	# Copyright (c) 2006 nixCraft project <http://www.cyberciti.biz/fb/>
	# Copyleft 2013 Stephen Larroque
	# This script is licensed under GNU GPL version 2.0 or above
	#
	# This script was inspired by a nixCraft script http://www.cyberciti.biz/tips/simple-linux-and-unix-system-monitoring-with-ping-command-and-scripts.html
	#
	# For more complex needs, take a look at:
	# - SmokePing: http://oss.oetiker.ch/smokeping/
	# - DropWatch: http://humblec.com/dropwatch-to-see-where-the-packets-are-dropped-in-kernel-stack/
	# - sjitter: http://www.nicolargo.com/dev/sjitter/
	# - iperf: http://iperf.fr/
	# -------------------------------------------------------------------------
	#=== PARAMETERS change them here
	# add ip / hostname separated by while space
	HOSTS="www.google.com"
	# no ping request
	COUNT=20
	# email report when
	#SUBJECT="Ping failed"
	#EMAILID="me@mydomain.com"
	#=== Local vars (do not change them)
	# Cron-friendly: Automaticaly change directory to the current one
	cd $(dirname "$0")
	# Current script filename
	SCRIPTNAME=$(basename "$0")
	# Current date and time
	today=$(date '+%Y-%m-%d')
	currtime=$(date '+%H:%M:%S')
	#=== Help message
	if [[ "$@" =~ "--help" ]]; then
	echo "Usage: bash $SCRIPTNAME
	Check the rate of packets loss and output the result in a file named plwatch.txt in the same directory as this script.
	Note: this script is cron-friendly, so you can add it to a cron job to regularly check your packets loss.
	"
	exit
	fi
	#=== Main script
	for myHost in $HOSTS
	do
	msg=$(ping -c $COUNT $myHost | grep 'loss')
	echo "[$today $currtime] ($myHost $COUNT) $msg" >> plwatch.txt
	#count=$(ping -c $COUNT $myHost | grep 'received' | awk -F',' '{ print $2 }' | awk '{ print $1 }')
	#if [ $count -eq 0 ]; then
	# 100% failed
	# echo "Host : $myHost is down (ping failed) at $(date)" | mail -s "$SUBJECT" $EMAILID
	#fi
	done