+ exit 2;
+}
+
+if (defined $opts{m}) {
+ my($n, $i) = ($opts{m} =~ /^(\d+),(\d+)$/);
+ if (!defined $n) {
+ print STDERR "$0: argument to -m must be of the form <n>,<i>\n";
+ exit 3;
+ }
+ $spy->restrict_modulo($n, $i);
+}
+
+if (defined $opts{r}) {
+ $spy->apply_rules($opts{r})