stops a single node.js instance

stop.sh

#!/bin/bash
#author: csanz

pid=`ps afx | grep "node" | grep "$1" | grep "app.js" | awk '{print $1'}`
if [ -z $pid ] 
  then
    echo "the node instance doesn't exists"
  fi
if [ "$pid" != '' ] 
  then
    echo "stopping PID $pid..."
    kill -9 $pid
    echo "node instance killed"
  fi