+# OK, so expr exits with 0 if the result is neither null nor zero; and
+# 1 if the expression is null or zero. This is the opposite of what
+# we want, and if we just call expr then this script will always fail,
+# because -e is set.
+
+set -x
+result=`expr $failed + $missing || true`
+echo "overall result is $result"