#!/bin/sh

while true
do if [ -e /sys/class/power_supply/BAT1/capacity ]         # Do we have a battery to monitor?
then sleep 60
x=`cat /sys/class/power_supply/BAT1/capacity`
if [ $x -le 25 ]                                           # When do we notify the user?
do aplay $FVWM_USERDIR/sounds/CritNotif.wav &
printf "Battery alert!\nYour battery only has a remaining capacity of $x%!" | xmessage -file - -center
sleep 300                                                  # Don't spam the user!!!
x=`cat /sys/class/power_supply/BAT1/capacity`              # Obtain new value.
else exit
fi
done