#!/bin/sh

while true
do sleep 60
x=`cat /sys/class/power_supply/BAT1/capacity`
while [ $x -le 25 ]
do aplay $FVWM_USERDIR/sounds/CritNotif.wav &
printf "Battery alert!\nYour battery only has a remaining capacity of $x!" | xmessage -file - -center
done
done