Simple reminder script for 20-20-20 rule

```
#!/bin/bash
# This program should be set in crontab to execute
# every 20 minutes.

paplay /usr/share/sounds/freedesktop/stereo/service-login.oga &
nid=$(notify-send -p "Reminder" "You have been working for 20 minutes. Look at something 20 feet away for 20 seconds." -i /usr/share/icons/gnome/48x48/status/appointment-soon.png)

sleep 1

for i in {1..20}; do
        notify-send -t 1100 -r "$nid" "Reminder" "You have been working for 20 minutes. Look at something 20 feet away for 20 seconds.\n$((20 - i)) seconds left." -i /usr/share/icons/gnome/48x48/status/appointment-soon.png &
        sleep 1
done

paplay /usr/share/sounds/freedesktop/stereo/service-logout.oga
```