A helpful Bash script that allows you to find a process running on a particular port and terminate it. Particularly useful for us web developers ;)

kill_port.sh

#!/bin/bash
# 
# kill_port PORT
#
# Find process running on a particular port and terminate it.

kill_port () {
  if [[ -z "$1" ]]; then
    echo 'Please specify PORT arg, e.g:'
    echo '    kill_port PORT'
    return 1
  fi

  PID="$(sudo lsof -i tcp:$1 | awk 'FNR == 2 {print $2}')"
  if [[ -z "$PID" ]]; then
    echo "No process found running on port $1"
    return 1
  fi
  kill -9 $PID
  echo "Killed process $PID on port $1"
}