Narasimhan, 
What you put down will work.  The information can be found a little more directly by doing the following. 

{{{
$> rosmsg package sensor_msgs
sensor_msgs/PointCloud
sensor_msgs/RegionOfInterest
sensor_msgs/JointState
sensor_msgs/CameraInfo
sensor_msgs/Imu
sensor_msgs/LaserScan
sensor_msgs/Image
sensor_msgs/ChannelFloat32
sensor_msgs/CompressedImage
}}}

Tully

On Mon, May 31, 2010 at 5:57 AM, Narasimhan <narasimhan1990@yahoo.co.in> wrote:

this question was asked in the post tutorial questionnaire.
What ROS messages are defined in the sensor_msgs package? write the command
line input and the list of messages

my answer was
rosls sensor_msgs/msg

what is the answer for this question?

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Tully Foote
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Willow Garage, Inc.
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