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#!/bin/sh
battery_dir='/sys/class/power_supply/BAT0'
[ ! -d "$battery_dir" ] && exit 1
if [ "$(cat "$battery_dir/status")" != 'Charging' ]
then
capacity="$(cat "$battery_dir/capacity")"
[ "$capacity" -lt 15 ] &&
notify-send -u critical "Battery low: $capacity%"
fi
exit 0
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