in line counter for looping bash script

loop.sh

#!/bin/bash
#
#  Enhanced version of the excellent original script here: 
#  https://www.cyberciti.biz/faq/how-to-display-countdown-timer-in-bash-shell-script-running-on-linuxunix
#
#  This script will continuously loop on a set interval and run whatever command you put on line 10. 
#  It will display a timer and count down the seconds until the next loop. 
#

cmd="/some/script/or/command"

# use 1 min as default value. Ovverride by setting INTERVAL_MINUTES env var.
if [ -z $INTERVAL_MINUTES ]; then
    INTERVAL_MINUTES=1
fi

while true; do

    # how long to wait
    SECONDS=$((INTERVAL_MINUTES * 60))

    # get current position on screen
    exec < /dev/tty
    oldstty=$(stty -g)
    stty raw -echo min 0
    # on my system, the following line can be replaced by the line below it
    echo -en "\033[6n" > /dev/tty
    # tput u7 > /dev/tty    # when TERM=xterm (and relatives)
    IFS=';' read -r -d R -a pos
    stty $oldstty
    # change from one-based to zero based so they work with: tput cup $row $col
    row=$((${pos[0]:2} - 1))    # strip off the esc-[
    col=$((${pos[1]} - 1))

    # offset the counter message so it's easier to see
    let row=$row+1
    let col=$col+2

    msg="Counting down to the next run... "
    count=$SECONDS

    # set cursor position
    tput cup $row $col
    echo -n "$msg"
    msg_length=${#msg}
    counter_column=$(( msg_length+$col+2 ))

    # output our timer
    while [[ $count > 0 ]]
        do       
          # clear the previous value
          tput cup $row $counter_column
          echo -n "                 "
          
          # write the new value
          tput cup $row $counter_column
          echo -n $count
          
          sleep 1
          let count=$count-1
        done
    echo
    echo

    $cmd || echo "run failed, trying again in $INTERVAL_MINUTES min."

    echo
    unset count
done

exit 0