This weekend I was trying to run a server on port 9000 but something was already on there. I had no idea what it was and needed to find and stop it. Here’s a super quick and easy way to do so:

You’ll need lsof:

sudo apt-get install lsof
lsof -iTCP:9000

The result I got was as follows:

COMMAND     PID      USER   FD   TYPE  DEVICE SIZE/OFF NODE NAME
komodo-bi 31713 myuser   51u  IPv4 1234567      0t0  TCP *:9000 (LISTEN)

From there it was as simple as going into komodo and turning turning off its listener 🙂

Thanks to Laran Evans for his useful tutorial.