Log the battery stete to a file

log_battery_state.sh

#!/bin/sh
# Log the battery stete to a file

# Sources of battery information
PROC_INFO='/proc/acpi/battery/BAT0/info'
PROC_STATE='/proc/acpi/battery/BAT0/state'

# Get the current state
type=`grep "model number:" $PROC_INFO | awk -e '{print $3}'`
current=`grep "remaining capacity:" $PROC_STATE | awk -e '{print $3}'`
last_full=`grep "last full capacity:" $PROC_INFO | awk -e '{print $4}'`

# Save to the file
output=$HOME/.battery_$type.log

id=`touch $output && wc -l $output | awk -e '{print $1}'`
datetime=`date +%Y%m%d%H%M%S`

line="$id $datetime $last_full $current"

echo $line >> $output