#!/bin/bash


PID=$(pidof dd)


main(){

  if [ -z "${PID}" ];then
    echo "DD is not running"
    exit 0;
  fi

  while true;do
    clear
    PID=$(pidof dd)
    if [ -z "${PID}" ];then
      echo "dd is no longer running"
      exit 0;
    fi
    kill -USR1 ${PID} > /dev/null 2>&1
    sleep 1
  done
}

main