Making simple CountDown program in Bash

Count-down script without user interaction:

#!/bin/bash

row=5

column=10

tput clear

for i in {30..00..00}

 do tput cup $row $column

 echo -e -n "Launch in: $i\n\n"

 sleep .1

done

echo -e 'Done!\n\n'

syntax to run this script: /path/to/countdown_auto.sh

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Count-down script with user interaction:

#!/bin/bash

row=5

column=10

max=$1

min=$2

interval=$3

if [ $# -ne 3 ]

then

    echo -e "Syntax is $0 <countdown starting value> <countdown ending value> <counting interval>"

else

    tput clear

    for i in `eval "echo {$max..$min..$interval}"`

    #for i in {20..01..2}

      do tput cup $row $column

      echo -e -n "Launch in: $i\n\n"

      sleep .1

    done

    echo -e 'Done!\n\n'

fi

syntax to run this script: /path/to/countdown.sh <countdown starting value> <countdown ending value> <counting interval>