PORT=$1

if [ -z "$PORT" ]; then
    printf "Invalid args. Please provide a port number.\r\n\r\n"
    exit 1;
fi

PIDS=$(sudo lsof -i tcp:$PORT | awk '{print $2}')

PREV_PID=''
COUNTER=0
for PID in $PIDS
do
    if [ "$PID" != "PID" ] && [ "$PID" != "$PREV_PID" ]; then
        printf "Killing process $PID on port $PORT\r\n"
        kill -9 $PID
        PREV_PID=$PID
        COUNTER=$(($COUNTER + 1))
    fi
done

if (($COUNTER < 2));
    then
        printf "No processes are running on port $PORT. Nothing to kill.\r\n\r\n"
    else
        printf "All done :) \r\n\r\n"
fi