Countdown timer in bash shell script

countdown.sh

#!/bin/bash
# $1 = # of seconds
# $@ = What to print after "Waiting n seconds"
countdown() {
  secs=$1
  shift
  msg=$@
  while [ $secs -gt 0 ]
  do
    printf "\r\033[KWaiting %.d seconds $msg" $((secs--))
    sleep 1
  done
  echo
}