rostpoic pub & teleop_key

edit

reference: http://wiki.ros.org/ROS/Tutorials/Usi...

I have a question: when 'roslaunch' launchs the turtlemimic.launch file, there appears two turtles' window. Why can I only use 'rostopic pub' command to drive the turtle1, however, I cannot use 'rosrun turtlesim turtle_teleop_key' command to do that. the instruction page: http://wiki.ros.org/ROS/Tutorials/Usi...

the 'rostopic pub' command: $ rostopic pub /turtlesim1/turtle1/cmd_vel geometry_msgs/Twist -r 1 -- '[2.0, 0.0, 0.0]' '[0.0, 0.0, -1.8]'

the 'rosrun turtlesim turtle_teleop_key' command: $ rosrun turtlesim turtle_teleop_key