Ports occupied by the various services

[ifxtechie]

I have two questions regarding my RH-9 Linux system:
1. My system has several services running on it. Is there
any way of knowing which services are running and on which
ports. Mainly I want to know which service is running at
port 80.
2. My DB2 [on the same system] does not start because the
system cannot allocate any shared memory segments. When I
saw using ipcs -ma, it showed several but I tried to kill
[using ipcrm] as the owner and also as root. But I could
not. To clear off these, I even rebooted the system.
Even that did not solve the problem. Any ideas?

Thanks very much for your help.

 

[thedaver]

#1: type "more /etc/services" to get a list of defined services on the box, and "lsof -Pni" to see what services are using which ports.

#2: no idea, sorry.

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