zenUtils/batAlarm.sh

#!/bin/sh

# Just a background script to tell you when your battery's low if you don't
# have a panel.
# Derek Stevens <nilix@nilfm.cc>
# MIT License

flag1=0
flag2=0

while true; do
  charge=$(cat /sys/class/power_supply/BAT0/capacity)
  if [ $charge -lt 11 ]; then
    if [ $flag1 -eq 0 ]; then
      flag1=1
      notify-send -t 10000 battery [${charge}%]
    fi
  elif [ $charge -lt 21 ]; then
    if [ $flag2 -eq 0 ]; then
      flag2=1
      notify-send -t 10000 battery [${charge}%]
    fi
  fi

  if [ $charge -gt 20 ]; then
    flag2=0
  fi
  if [ $charge -gt 10 ]; then
    flag1=0
  fi
  
  sleep 30
done