A battery life indicator that fits nicely in a $PS1

drawbat.sh

#!/bin/bash

endcolor="\033[1;31m"
innercolor="\033[1;33m"
nocolor="\033[0m"
charge_now=$(cat /sys/class/power_supply/BAT0/charge_now)
charge_full=$(cat /sys/class/power_supply/BAT0/charge_full)
percent=$(echo "scale=2; ( $charge_now / $charge_full ) * 100" | bc | sed 's/\(.*\).../\1/g')
bars=$(echo "($percent / 20) + 1" | bc)

#echo -ne "$endcolor[$innercolor"
for i in {1..5}
do
  if [ $bars -gt $i ] || [ $bars -eq $i ] && [ $percent -gt 5 ]
  then
    echo -n "|"
  else
    echo -n " "
  fi
done
#echo -ne "$endcolor}$nocolor"