#!/bin/bash
if [ $1 = "-h" ]
then
  echo usage: $0 [ max. ping parallel] [url]
  exit 0
fi

n=${1-500}
url=${2-www.google.de}

echo $url
ping $url &
typeset -i i=0
while [ $i -lt $n  ]
do
  ping $url > /dev/zero &
  i=`expr $i + 1`
  echo $i
  sleep 1
done