Kills the process which is using a given port

kill-porthog.sh

#!/bin/bash

re='^[0-9]+$'
if ! [[ $1 =~ $re ]] ; then
   echo "error: Port must be a number" >&2; exit 1
fi

pids=( $(sudo lsof -ti:$1) )
if [[ ! -z "$pids" ]]
then
  for pid in "$pids"; do
    echo "Killing process $pid"
    sudo kill -9 "$pid"
  done
else
  echo "Port $1 not in use"
fi