countdown on bash

#!/bin/bash

WTIMEOUT=10 #vremya ozhidaniya

while [ $WTIMEOUT -ge 0 ];do
    tput sc #zapominaem poziciu kursora
    printf '%3s' $WTIMEOUT  #vivodim znachenie peremrnnoi
                #(3 - chislo probelov, esli stroka menshe 3 simvolov
                #to nedostajushie simvoly v nachale stroki budut
                #probely)
    tput rc #ustanavlivaem kursor na staroe mesto
    sleep 1
    let "WTIMEOUT=WTIMEOUT-1"
done