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I'm running a Node.JS application and need to figure out if something is using a certain port.

How can I do this from the linux command line?

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marked as duplicate by Dave M, Kevin Panko, Doktoro Reichard, Garrett, Scott Jul 15 '14 at 21:50

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There must be a more elegant way, but when in a hurry, I just run netstat | grep port_number

Yes, there are more elegant ways...

Linux List The Open Ports And The Process That Owns Them

sudo lsof -i
sudo netstat -lptu
sudo netstat -tulpn
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