Occasionally, a process on my computer will open a port and refuse to release it. Here’s how to find the process and kill it.
lsof -i tcp:PORTNUMBER
For example, if I have a Rails server running in the background, I can run:
lsof -i tcp:3000
To find the Rails process and its PID. To kill that process, I can then run:
kill -9 PIDNUMBER
Or, to combine searching for the process and killing it into one command:
kill -9 $(lsof -ti tcp:PORTNUMBER)
I needed a way to connect and communicate between these devices in places with unreliable WiFi.
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