Who has port X open?

[Brian J. Conway]

> How can I tell what program has port X opoen?

As was sorta already mentioned, to see what's using what, I normally go
for 'netstat -tu' to see TCP and UDP connections, and 'netstat -tup' to
see what programs are attached to those sockets.  Also, 'netstat -tul'
is nice for seeing what services are listening on particular ports.  I
avoid the -n, personally, as I like seeing both the dns and socket name
resolutions.

-b

P.S. I first read that and thought, "Wait, don't you always need port
6000 open to run X?", my mistake. ;-)
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