Required package : beep

Utility scenario : let's play a melody to warn you if your battery is discharging :

Install in your crontab (crontab -e) the following line :

• • • • • /bin/grep Discharging /sys/class/power_supply/BAT1/status >/dev/null && /bin/sh /path/to/your/beepfile/beep/sacre.sh >/dev/null 2>&1