First, start ros
roscore
roscore separate out a command terminal is operating, and can not run at the same time two roscore. roscore order to make a master operation. I guess ros in only one master, which is why not run for two reasons roscore command at the same time, to be verified .
Second, start small turtles
A single open end, + shift + t may open a new terminal ctrl command in the same window. input the command:
rosrun turtlesim turtlesim_node
A small turtle window will appear:
Rosrun format command is: rosrun [package_name] [node_name]. Thus turtlesim a function package, for a node turtlesim_node function package.
And this time you open a new terminal to run another node
rosrun turtlesim turtle_teleop_key
You can control the movement of the turtle through the keyboard. Note that the arrow must be placed on this terminal command to move the turtle
