## screensaver.sh
## Set screen saver enable for all users to 900 seconds (15 minutes)

ETHADDR=`system_profiler SPNetworkDataType | grep -m 1 "MAC Address" | awk {'print $3'} | tr -d :`

killall 'System Preferences' 2> /dev/null

USERLIST=`niutil -list . /users | awk {'print $2'}`

for USERNAME in $USERLIST
do
	HOMEFOLDER=`niutil -readprop . /users/$USERNAME home`
		if [[ "$HOMEFOLDER" != /var/* && "$HOMEFOLDER" != "/Library/WebServer" ]] ; then # should be all normal users
			IDLE=`sudo defaults read "$HOMEFOLDER"/Library/Preferences/ByHost/com.apple.screensaver.$ETHADDR idleTime`
			if [[ "$IDLE" -gt "900" ]] ; then
				sudo defaults write "$HOMEFOLDER"/Library/Preferences/ByHost/com.apple.screensaver.$ETHADDR idleTime '900'
				sudo chown "$USERNAME" "$HOMEFOLDER"/Library/Preferences/ByHost/com.apple.screensaver.${ETHADDR}.plist
				NEWIDLE=`sudo defaults read "$HOMEFOLDER"/Library/Preferences/ByHost/com.apple.screensaver.$ETHADDR idleTime`
				echo "Screen saver time changed from $IDLE to $NEWIDLE seconds for $USERNAME"
				echo
			else
				echo "$USERNAME: PASS"
			fi
		fi
done

exit 0