Bash Prompt HOWTO:
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# 11.11. Laptop Power

If you have a laptop with APM installed, try the following PROMPT_COMMAND to create an environment variable `${battery}` you can add to your prompt. This will indicate if AC power is connected and percentage power remaining. AC power is indicated by a "^" (for on) and a "v" (for off) before the percentage value.

    function prompt_command {
    	#  As much of the response of the "apm" command as is
    	#  necessary to identify the given condition:
       NO_AC_MESG="AC off"
       AC_MESG="AC on"

       APMD_RESPONSE="$(apm)"
       case ${APMD_RESPONSE} in
          *${AC_MESG}*)
             ACstat="^"
             ;;
          *${NO_AC_MESG}*)
             ACstat="v"
             ;;
       esac

       battery="${temp##* }"
       battery="${ACstat}${battery}"
    }

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