Display message and log out user

#!/bin/bash

#Script to prevent login of users
#As of OS X 10.9 MCX- and profile-based methods for this do not seem to be working
#Code borrowed from https://jamfnation.jamfsoftware.com/discussion.html?id=4591
#Exclude authorised users and groups in the policy scope

user=$USER     #Use existing Casper variable for user
heading=$'You are not authorised to use this facility.'
description=$'This is a specialist facility available only to selected students and staff within ADI.'
icon='/System/Library/CoreServices/CoreTypes.bundle/Contents/Resources/ToolbarDeleteIcon.icns'

echo "$user is not authorised to use this Mac.  Killing login session..."
/Library/Application\ Support/JAMF/bin/jamfHelper.app/Contents/MacOS/jamfHelper -windowType fs -heading "$heading" -icon "$icon" -description "$description" -alignHeading centre &
sleep 10
killall jamfHelper
kill `ps -ef | fgrep loginwindow | grep -v grep | awk '{print $2}'`
exit 0

To be called by a Casper Policy that's scoped to all groups, excluding ones that are allowed to log in to the client. Or you could scope it to limit to users/groups you don't want to log in...