--- a/bin/pvl.verkko-rrd	Sun Jan 20 18:26:54 2013 +0200
+++ b/bin/pvl.verkko-rrd	Sun Jan 20 18:31:21 2013 +0200
@@ -52,6 +52,10 @@
     options, args = parse_argv(argv, doc=__doc__)
 
     # rrd
+    if not options.rrd :
+        log.error("no --rrd given")
+        return 2
+
     rrd = pvl.verkko.rrd.RRDDatabase(options.rrd)
 
     # app