Kills local process listening on port 3000. I use this to kill my detached development server on http://0.0.0.0:3000.

killrs

#! /bin/bash
# kills any process listening on port 3000

KILLPID=`lsof -t -i :3000`

if [ -z $KILLPID ]; then
  echo "Nothing listening on port 3000"
else
  kill -9 $KILLPID
fi