By Manu Zacharia
manu[at]theadmins[dot]info

A Small Bash Script to identify all systems on the network that responds to your ping request. In Ethical Hacking and Penetration Testing, this is known as a Ping Sweeper.

 #/bin/bash

# Author - Manu Zacharia
# Date - 19 Feb 08
# Purpose - To identify all the systems that responds to ping request.
# Output - Returns the IP Address of responding system

clear
echo -e "\n"    # new line
echo "=========================================================== "
echo "Enter the Class C Network Address to scan (Ex: 192.168.100): "
echo "=========================================================== "
read -e A

clear
echo -e "\n"    # new line
echo "================================="
echo "PING SWEEPING NETWORK" $A.0
echo "================================="

for I in `seq 1 254`; do
        ping $A.$I -c 1 -w 1 | grep "bytes from" | cut -d" " -f4 | cut -d":" -f1 &
done

echo "================================="

 Note: This script scans only a single subnet and not multiple subnets. 

By Manu Zacharia
manu[at]theadmins[dot]info

If you have downloaded an ISO Image file and looking for a way to mount it - just read ahead. You can mount an ISO Image as a loopback device. This will allow you to access the contents of the ISO Image file without having to burn it into a CD ROM or DVD ROM. But there is a catch here. To able to mount an ISO as a loopback device, you must have loopback compiled into your Linux Kernel. But don't worry, most new generation distros will have this feature enabled by default.