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Time countdown bash script example

Last Updated on Friday, 11 June 2010 21:27 Friday, 11 June 2010 20:50

This is a simple skeleton of a bash countdown script. The script takes two arguments . Here are some examples of its usage:

• countdown time to 90 minutes from now:

./bash-countdown.sh -m 90

• countdown time to 23.3.2036 from now:

./bash-countdown.sh -d "Mar 23 2036"

• countdown time to 21:06 from now:

./bash-countdown.sh -d 21:06

• countdown time to 21:06:45 from now:

./bash-countdown.sh -d 21:06:45

Feel free to modify this script according to your needs:

bash-countdown.sh :

#!/bin/bash 
 
if [ "$#" -lt "2" ] ; then 
	echo "Incorrect usage ! Example:" 
	echo './countdown.sh -d  "Jun 10 2011 16:06"' 
	echo 'or' 
	echo './countdown.sh -m  90' 
	exit 1 
fi 
 
now=`date +%s` 
 
if [ "$1" = "-d" ] ; then 
	until=`date -d "$2" +%s` 
	sec_rem=`expr $until - $now` 
	echo "-d" 
	if [ $sec_rem -lt 1 ]; then 
		echo "$2 is already history !" 
	fi 
fi 
 
if [ "$1" = "-m" ] ; then 
	until=`expr 60 \* $2` 
	until=`expr $until + $now` 
	sec_rem=`expr $until - $now` 
	echo "-m" 
	if [ $sec_rem -lt 1 ]; then 
		echo "$2 is already history !" 
	fi 
fi 
 
 
while [ $sec_rem -gt 0 ]; do 
	clear 
	date 
	let sec_rem=$sec_rem-1 
	interval=$sec_rem 
	seconds=`expr $interval % 60` 
	interval=`expr $interval - $seconds` 
	minutes=`expr $interval % 3600 / 60` 
	interval=`expr $interval - $minutes` 
	hours=`expr $interval % 86400 / 3600` 
	interval=`expr $interval - $hours` 
	days=`expr $interval % 604800 / 86400` 
	interval=`expr $interval - $hours` 
	weeks=`expr $interval / 604800` 
	echo "----------------------------" 
	echo "Seconds: " $seconds 
	echo "Minutes: " $minutes 
	echo "Hours:   " $hours 
	echo "Days:    " $days 
	echo "Weeks:   " $weeks 
	sleep 1 
done 

Do not forget to make bash-countdown.sh script executable before execution:

$ chmod +x bash-countdown.sh

Exectute:

./bash-countdown.sh -d 22:34

Output:

Fri Jun 11 20:55:19 EST 2010
----------------------------
Seconds:  40
Minutes:  38
Hours:    1
Days:     0
Weeks:    0

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