Using ROS nodes, ROS topics and ROS services, the following pattern is recursively traced on the turtlesim simulator.
$ roscore
Keep the roscore running, and in a new terminal, you can install the turtlesim simulator using the following command:
$ sudo apt-get install ros-$(rosversion -d)-turtlesim
$ catkin_make
$ source ./devel/setup.bash
Great! Now, run the launch file and watch the turtles roaming around in a not so beautiful pattern😅:
$ roslaunch captain_america captain_america.launch