Reminder to drink a glass every two hours.

drinkalert.sh

#!/bin/bash

### Remind me to drink a glass every two hours. 
# WHO recommends 3 Liters per day. I am abound 16 hours awake. My glass can hold 0.4 Liters.
#   400ml / (3l / 16h) = 2.133h; which would include a factor of savety of  1.07 ;)
###

while true; do
	notify-send "drink a drink";
	sleep $(echo "7200 - 3600*("$(date +%k)" % 2) - 60*("$(date +%M)") - "$(date +%S) | bc)
done