#!/bin/sh

# PingSubNet.sh
# Wed Nov 26 14:32:36 PST 2008
# Chieh Cheng
# http://www.CynosureX.com/

# GNU General Public License (GPL) Version 2, June 1991

usage ()
{
  scriptName=`basename "$0"`
  echo "  Usage:  ${scriptName} subnet"
}

if [ $# -eq 1 ]
then
  subnet="$1"
  count=1
  while [ ${count} -lt 256 ]
  do
    ip=`echo "${subnet}.${count}" | sed "s/\.\.*/./g"`
    printf "Pinging ${ip} . . . "
    output=`ping -c 1 -t 1 ${ip}`
    result=`echo "${output}" | grep -c " 0% packet loss"`
    if [ "${result}" = "1" ]
    then
      echo "alive!"
    else
      printf "dead.\r"
    fi
    count=`expr ${count} + 1`
  done
  if [ "${result}" != "1" ]
  then
    echo
  fi
else
  usage
fi