#!/bin/sh

PATH=/sbin:/bin:/usr/bin

# Get the ID of the first active X11 session:

uid_session=$(

ck-list-sessions | \

awk '

/^Session[0-9]+:$/ { uid = active = x11 = "" ; next }

{ gsub(/'\''/, "", $3) }

$1 == "unix-user" { uid = $3 }

$1 == "active" { active = $3 }

$1 == "x11-display" { x11 = $3 }

active == "TRUE" && x11 != "" {

	print uid

	exit

}')

# Check that there is a power manager, otherwise shut down.

[ "$uid_session" ] &&

ps axo uid,cmd | \

awk '

    $1 == '$uid_session' &&

	($2 ~ /gnome-power-manager/ || $2 ~ /kpowersave/ ||

	 $2 ~ /kded4/ || $3 ~ /guidance-power-manager/) \

		{ found = 1; exit }

    END { exit !found }

' ||

  shutdown -h now