Source: sebastiandedeyne.com

Finding out which ports are in use
Sometimes you want to spin up a process, but the port it wants to bind to is already in use. Or a port isn’t listening to a process as you expected.

This will list all processes listening to a port. If you want to find a process on a specific port, you can chain another grep. I occasionally send out a newsletter with personal stories, things I’ve been working on in the past month, and interesting things I come across.
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