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#!/bin/bash
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hour=0
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min=0
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[[ ! $1 ]] && sec=10 || sec=$1
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while [ $hour -ge 0 ]; do
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while [ $min -ge 0 ]; do
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while [ $sec -ge 0 ]; do
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echo -ne "$hour:$min:$sec\033[0K\r"
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let "sec=sec-1"
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sleep 1
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done
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sec=59
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let "min=min-1"
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done
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min=59
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let "hour=hour-1"
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done
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