A small script to implement countdown in bash

countdown.sh

#!/bin/bash

# A small script to implement countdown in bash

seconds=200; # Set countdown time in seconds
date1=$((`date +%s` + $seconds));  # to get future time in seconds

# for asthetics
echo ""

# when present time is greater than or equal to the future time
while [ "$date1" -ge `date +%s` ];
do
    # print the difference in time with -ne flag for input in same line
    echo -ne "Tick tock $(date -u --date @$(($date1 - `date +%s` )) +%H:%M:%S)\r";
done