Simple timer for Pomodoro Technique in shell script

pomodoro.sh

#!/bin/bash

# http://www.pomodorotechnique.com/

#Icones:
#/usr/share/icons/hicolor/48x48/apps/typing-monitor.png
#/usr/share/icons/hicolor/48x48/apps/evolution-tasks.png

#Requisitos:
#sudo apt-get install beep
#sudo apt-get install libnotify-bin

echo "`date` Pomodoro session, started!"

minutes_remaining=25

for (( i = 0; i <= 4; i++)) do
    minutes=$((60 * 5))
    sleep $minutes

    minutes_remaining=$(($minutes_remaining - 5))
    echo "`date` Remaining $minutes_remaining minutes ..."

    if [ $minutes_remaining -eq 5 ]; then
        notify-send "PomodoroSession" "Remaining $minutes_remaining minutes ..." -i /usr/share/icons/hicolor/48x48/apps/evolution-tasks.png
        beep
    fi
done

notify-send "PomodoroSession" "Session is Over! Take a break of 5 minutes." -i /usr/share/icons/hicolor/48x48/apps/typing-monitor.png
beep