+# 'sudo tc qdisc add dev lo root netem delay 50ms'
+# You'll need kernel-modules-extra installed, or you get
+# an unhelpful error from RTNETLINK.
+# To tidy up: 'sudo tc qdisc delete dev lo root'
+#
+sudo perl
+system ("tc qdisc add dev lo root netem delay 50ms");
+****