how can i find out whats my port number
eh ? you mean ip address ?
/sbin/ifconfig will report your ip_address.
nmap is a greap port scanner.
nmapfe is a gui frontend.
and you can find out sombody else's ip address by asking them nicely...
chances are they will tell you to go fcuk yourself
and dont go port scanning any machines you dont own / are in charge of.
you can get into trouble.