Network scanner script

One of the more useless handiwork of a wasted 2 hour lab session:

A shell script for scanning the network with Class C IP Addresses from 192.168.0.1 to 192.168.255.255 and listing the active IP addresses. It writes it to a file called IP_list as well as echoes it.

ip_scan.sh:
-------------------------------------------------------------------

#!/bin/bash

# A Useless network scanner
# by Shashank Shekhar
# - Scans the Class C network from 192.168.0.1 to 192.168.255.255
# - Note: Ping doesn't always return the true state of a network node
##

for ((i = 1; i < 256; i++))
do
 for ((j = 0; j < 256; j++))
  do
   ping -c 1 -w 1 192.168.$j.$i > opFile
   cnt=$(grep -c -i " 0% packet loss" opFile)
   if test $cnt -eq 1
   then
     echo "192.168.$j.$i is there" >> IP_list
     echo "192.168.$j.$i is there"
   fi
 done
done

Cheers
~Shashank
PS: I was so bored.

Edit: Evil text-garbling spirits, Stay Away!