A simple laptop battery monitor script

The script displays alert when the battery falls below 20% or charges up beyond 80% which should be the optimal range of its working.

The code is as below. Just copy and paste and save as any file name but preferably battery-notify.sh. The script can independent of what name it is given. Needs to have acpi (default install) and notify-send installed (sudo apt-get install notify-osd).


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#!/bin/bash


# battery-notify v1.2 by JOnes


# It is a script to monitor battery and keep it between 20% to 80% the optimal battery working range. If the battery goe beyonds the set limit it gives pop-ups every 10 seconds. No sound warning as sound can easily be muted and ignored.
# Things that could be added : 1> The flexibilty of range. But it is not recommended  hence not implemented. 2> Notification in form of email or sms. 3> Sound / beep for critical state of battery.
# The script goes into background. To kill it at any time use : kill `pgrep battery-notify`


# check if "acpi" and "notify-send" is installed.



if [ ! `which acpi` ] ; then
echo -e "Install acpi  \nsudo apt-get install acpi"
exit 0
fi


if [ ! `which notify-send` ] ;then
echo -e "Install notify-send \nsudo apt-get install libnotify-bin"
exit 0
fi

v1=`echo $0 | sed 's/\.//' | sed 's|\/||' ` 


echo -e "The script goes into background. To kill it at any time use : kill \`pgrep $v1\`" 


{
while [ 1 ]
do
# this snippet extracts the battery status as percentage
aa=`acpi | cut -d"," -f2 | tr -d "% "`
# grep -c counts the no. of occurance of the text
bb1=`acpi | grep -c "Discharging"`
bb2=`acpi | grep -c "Charging"`
#echo $bb1 $bb2


# if discharging then
if [[ $bb1 > 0 ]] ; then
if [[ $aa < 20 ]] ; then 
 notify-send -t 100 "Battery Status: $aa%. Plug charger" 
fi
fi


# if charging then
if [[ $bb2 > 0 ]] ; then
if [[ $aa > 80 ]] ; then 
 notify-send -t 1000 "Battery Status: $aa%. Unplug charger." 
fi
fi


sleep 10
done


}&

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