#!/bin/sh


pwfile="/etc/passwd"

for user in $(sed -e 's/^\(.*\):x:\(.*\):.*:.*:.*:.*$/\1/' $pwfile) ; do
	uid="$(grep -e "^$user:.*$" $pwfile | cut -d: -f 3 )"
	if [ "$uid" -lt "500" ] ; then
		blacklist="$blacklist $user"
	fi
done

sed -i "s/^black.*/black=$blacklist/" /etc/lxdm/lxdm.conf