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I have an app running (let's call it While I have a GUI way to find out what port it's listening for requests on, I'd like to find out using the command line. I really have no idea how to go about it :)


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up vote 2 down vote accepted
lsof -i

will show you a list of all open connections.

lsof -i | grep LISTEN

will show you a list of all ports being listened on. The left most column indicates the process listening.

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