bat_spk.sh

#!/bin/sh
#Test script to beep at low charge
#Operands:
#Low charge percent [in percents]
#Length of beep [in milliseconds]
#Number of beeps
#Delay between beeps [in milliseconds]
while true; do #infinite loop
state=$(upower -i $(upower -e | grep battery) | grep state | awk '{print $2}')
percent=$(upower -i $(upower -e | grep battery) | grep percentage | awk '{print $2}' | awk -F % '{print $1}')
#is battery not charging and its percent lower than input parameter?
if [ $state = "discharging" ] && [ $percent -lt $1 ]
then
        abeep -l $2 -r $3 -d $4 > /dev/null
        #beep -l $2 -r $3 -d $4 > /dev/null
fi
done