How do we find the port number

[bhawani123]

Hello Guys,

Can you help me out about my query?How do we find out the port number and Activity running
on that port number?

Thanks in advance

Thanks
Ajay Lohani

 

[lfoata]

I am not sure what you are looking for but you can find the port number for a service in the file /etc/services. Too bad I.T. is not cash business

Luc Foata
Unix sysadmin, Oracle DBA

 

[NavinB]

Hi,
U can use these two commands:-
#grep <service name> /etc/services (This shows the port no.)
#netstat -a|grep <service name> (If the port is listening or active)

I hope this helps......

 

[kporeddy]

use lsof command

 

[bhawani123]

Thanks NavinB,

With help of your Suggested solution I got a partial Solution from your second command.can you clear how could I check numbers of services running on that perticular port?
This Port is not defined in /etc/services file and I Added this port for perticular Service.
Now I want to see how many daemon ruuning on that port?

Thanks For your valuable suggestion.

Thanks
Ajay

 

[bhawani123]

Hello kporeddy,

There is no command and Manual page of lsof.

Thanks,
Ajay Lohani

 

[crowe]

lsof is not native to the OS. It is a utility that shows open files, and who is accessing them.
If your utility/daemon is running,

# netstat -a | grep (port_number)

will show you the active connections, or a listening port.

crowe