Identify if a host is UNIX,WIN or ESX.

Nmap string:

nmap -n -P0 -sT -p 111,139,445,514,5989

1.  If Port 111 or 514 is “open”, then UNIX

2.  If Port 139 or 445 is open, then WINDOWS

3.  If Port 5989 is open, then ESX