battery-notification.sh

#!/usr/bin/env bash

##########
## Name: battery-notification.sh
## Author: Adapted from the original script by Nicholas Neal (nwneal@kisoki.com)
## Description:
##                      This is a small script that will install itself to cron
##                      and run every minute, and check if your battery level is
##                      low, and send an alert to your desktop as appropriate
##
## Dependencies: acpi, notify-send
##
## Tested on Ubuntu Desktop 18.04.2 LTS
##########

eval "export $(egrep -z DBUS_SESSION_BUS_ADDRESS /proc/$(pgrep -u $LOGNAME gnome-session)/environ)";

# check if acpi and send-notify are installed.
if [ `dpkg -l | grep acpi | grep -v acpi-support | grep -v acpid | grep -c acpi` -ne 1 ]; then
        echo "run 'sudo apt install acpi' then run '$0' again."
        exit
fi

if [ $# -eq 1 ] && [ "$1" == "--install" ]; then
        echo "installing battery notifier..."

        if [ ! -e "$HOME/bin" ]; then
                mkdir $HOME/bin
        fi

        cp $0 $HOME/bin/bn.sh
        (crontab -l 2>/dev/null; echo "*/2 * * * * $HOME/bin/bn.sh") | crontab -

else
        # check if power adapter is plugged in, if not, check battery status.
        if [ -z "`acpi -a | grep on-line`" ]; then
                batlvl=`acpi -b | grep -P -o '[0-9]+(?=%)'`

                if [ $batlvl -le 30 ] && [ $batlvl -ge 20 ]; then
                        /usr/bin/notify-send --hint int:transient:1 "Battery Alert"  "Battery is at $batlvl%. Please plug your computer in."
                elif [ $batlvl -le 20 ] && [ $batlvl -ge 10 ]; then
                        /usr/bin/notify-send --hint int:transient:1 "Battery Alert"  "Battery is at $batlvl%. Computer will shutdown soon"
                elif [ $batlvl -le 10 ]; then
                        /usr/bin/notify-send  --hint int:transient:1 "Battery Alert" "BATTERY CRITICALLY LOW, YOUR COMPUTER WILL SHUTDOWN ANY MOMENT!"
                fi
        fi
fi
                                                                                                                                47,1          Bot