gistfile1.sh

#!/bin/sh

if [ -z "$1" ]; then
   echo "Usage: $0 <PORT>";
   return 1;
fi

PID=$(lsof -i :$1 | tr -s ' ' | cut -d ' ' -f 2 | sed -n 2p)

if [ -z "$PID" ]; then 
    echo "Can't find Process in that port";
    return 1;
else 
    kill -9 $PID;
    echo "Done!";
    return 0;
fi