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** <code>rostopic list</code> will list active topics on a running rosmaster
** <code>rostopic list</code> will list active topics on a running rosmaster
** <code>rostopic echo</code> echoes messages from the topicros
** <code>rostopic echo</code> echoes messages from the topicros
* [http://wiki.ros.org/rosmsg rosmsg]: display information about message types
* [http://wiki.ros.org/rosmsg#rossrv rossrv]: display information about services