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diff --git a/examples/popen.py b/examples/popen.py
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+++ b/examples/popen.py
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+#!/usr/bin/python
+
+"""
+This example monitors a number of hosts using host.popen() and
+pmonitor()
+"""
+
+from mininet.net import Mininet
+from mininet.node import CPULimitedHost
+from mininet.topo import SingleSwitchTopo
+from mininet.log import setLogLevel
+from mininet.util import custom, pmonitor
+
+def monitorhosts( hosts=5, sched='cfs' ):
+ "Start a bunch of pings and monitor them using popen"
+ mytopo = SingleSwitchTopo( hosts )
+ cpu = .5 / hosts
+ myhost = custom( CPULimitedHost, cpu=cpu, sched=sched )
+ net = Mininet( topo=mytopo, host=myhost )
+ net.start()
+ # Start a bunch of pings
+ popens = {}
+ last = net.hosts[ -1 ]
+ for host in net.hosts:
+ popens[ host ] = host.popen( "ping -c5 %s" % last.IP() )
+ last = host
+ # Monitor them and print output
+ for host, line in pmonitor( popens ):
+ if host:
+ print "<%s>: %s" % ( host.name, line.strip() )
+ # Done
+ net.stop()
+
+if __name__ == '__main__':
+ setLogLevel( 'info' )
+ monitorhosts( hosts=5 )