Scan machine for open ports (simple)

To simply scan an ip address for open ports with nmap, all you have to do is type the command below in your terminal:

nmap ip_address

and you will get an answer like this from nmap:

Starting Nmap 5.21 ( http://nmap.org ) at 2011-12-22 03:21 PST
Nmap scan report for x.x.x.x
Host is up (0.026s latency).
Not shown: 995 filtered ports
139/tcp  open  netbios-ssn
443/tcp  open  https
445/tcp  open  microsoft-ds
912/tcp  open  unknown
3389/tcp open  ms-term-serv

Nmap done: 1 IP address (1 host up) scanned in 47.62 seconds