eyesaver

#!/bin/sh

tm=$((5 * 60 / 100))
(
for i in {1..5}; do
    sleep $tm;
    echo $i;
done;
for i in {6..100}; do
    sleep $tm;
    echo $i;
    xset dpms force off
done;
) |
zenity --progress --title='Take a rest' --text='Take a rest...'