Battery monitoring from console

If you prefer to work on a console based machine (without gdm\kdm), the following script is useful if you are running your laptop on battery. It shows the current battery charge and can be used for monitoring the battery discharge.

#!/bin/sh
# While working in console mode (without gdm) this script
# tells you the remaining charge of your laptop battery
#
# Run it along with watch on a separate tty
# $ watch -n 10 ./batmon
#
# (c) Hunterwala, 2009
#
# TODO: check for error levels and buzz using pcspkr mod
# when the charge level decreases beyond that level.

PROC_PATH="/proc/acpi/battery/BAT0"

org_cap=`cat $PROC_PATH/info | grep "last full capacity" | sed "s/ //g" | awk -F: '{print($2)}' | sed "s/mAh//g"`
rem_cap=`cat $PROC_PATH/state | grep "remaining capacity" | sed "s/ //g" | awk -F: '{print($2)}'| sed "s/mAh//g"`
message=`cat $PROC_PATH/state | grep "charging state" | sed "s/ //g" | awk -F: '{print($2)}'| sed "s/mAh//g"`

diff=$(echo "($org_cap-$rem_cap)" | bc)
total_per=$(echo "100-($diff*100/$org_cap)" | bc)

echo "Battery is" $message ":" $total_per"%"

Save this script as batmon.sh

Change the permissions chmod a+x batmon.sh

Run it on a separate tty watch -n 10 ./batmon.sh