Return true when Mac battery percentage is under 10 percent

LowBatteryPercentage.sh

#!/bin/sh

# Use this shell script in combination with ControlPlane (http://www.controlplaneapp.com) to detect
# and automatize when the battery percentage is lower or equal than 10 percent.
# For example: let ControlPlane close for you all Cloud applications when you to low battery life.

batteryPercentage=`pmset -g batt | egrep -ow '([0-9]{1,3})[^%]'`
lowbatPercentage=10

if [ ${batteryPercentage} -le ${lowbatPercentage} ]; then
	exit 0
else
	exit 1
fi