Scanning for open ports of an ip address in backtrack 5 r2

Today I am gonna tell you how to scan for open ports of an ip address in backtrack 5 r2. Follow all the steps according to post:------------------->
1. First you have to find ip address of a website, to do this open terminal and type ping www.sitename.com and hit entre and here you will find the ip address.
2. Now you have the ip address and now you have to scan for ports.

Open terminal and type nmap and press entre and now type nmap -v -A ip address and hit enter in place of ip address type the ip address of website and hit enter. Now it will starts scanning the ports and it will tell you how many ports are open, like in  image.