Who has port X open?

[jc at trillian.mit.edu (John Chambers)]

Charles C. Bennett writes:
|
| > How can I tell what program has port X opoen?
|
| netstat -ap


: netstat -ap
netstat: illegal option -- p
usage: netstat [-veenNcCF] [<Af>] -r         netstat {-V|--version|-h|--help}
       netstat [-vnNcaeo] [<Socket>]
       netstat { [-veenNac] -i | [-vnNc] -L | [-cnNe] -M }
...


This is on a fairly new valinux box.  I think the system is
really a redhat something, though I'm not too clear on just
how one determines this.  "uname -r" says "2.2.13-0.7".  Is
the p option something that was just added to netstat?

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