Linux bash Timer

Question

好的，愚蠢的新手问题。我以为我正在制作倒计时计时器。应该从5点计数，一旦在0处，然后执行回声"时间是小丑"，然后结束。我在这里做错了什么？

seconds=5
date1=$((`date +%s` + $seconds)); 
while [ "$date1" -ne `date +%s` ]; do 
  if (!$date1 -lt ((`date +%s` + $seconds)+1)); then
     echo "time is up clown";
  break;
  fi;
  echo -ne "$(date -u --date @$(($date1 - `date +%s` )) +%H:%M:%S)r";
done

Answer 1

#!/bin/bash
SECS=5
while [[ 0 -ne $SECS ]]; do
    echo "$SECS.."
    sleep 1
    SECS=$[$SECS-1]
done
echo "Time is up, clown."