topic Re: Services, ports. in Operating System - Linux

Services, ports.

Caronte — Thu, 25 Feb 2010 23:05:10 GMT

How can i know the port and service for applications on the system.

i know netstat command but i do not know how i can get the service and/or port.

thanks a lot.

Re: Services, ports.

Steven Schweda — Fri, 26 Feb 2010 00:58:28 GMT

I can't say that I understand what you would
really like to know, but for a brief
discussion of another, similarly unclear
request, see:

http://forums.itrc.hp.com/service/forums/questionanswer.do?threadId=1410504

(But ignore the misleading references there
to "reservation" and "reserve".)

Is there some actual problem which you wish
to solve?

Re: Services, ports.

Elko — Fri, 26 Feb 2010 07:32:41 GMT

known services on linux ( and windows as well ) are decribed in file
/etc/services

cat /etc/services will show its content

Hope this helps

Re: Services, ports.

Ralph Grothe — Fri, 26 Feb 2010 09:28:48 GMT

If it's the already running service that you would like to identify then as root you can execute

# netstat -tlnp

for listening tcp sockets with the pid/program that has that socket open printed in the last column (note, the -p option for GNU/netstat only works as root).
Likewise, for udp ports run

# netstat -ulnp

Of course,

# lsof -nPi | grep LISTEN

does also work.