Robot Operating System - ROS 2 - publish data to a topic directly from the command line

The turtle (and commonly the real robots which it is meant to emulate) require a steady stream of commands to operate continuously. So, to get the turtle moving, and keep it moving, I do use the three command as below. It’s important to note that this argument needs to be input in YAML syntax.

1. ros2 topic pub /turtle1/cmd_vel geometry_msgs/msg/Twist "{linear: {x: 2.0, y: 0.0, z: 0.0}, angular: {x: 0.0, y: 0.0, z: 1.8}}"

2. ros2 topic pub /turtle1/cmd_vel geometry_msgs/msg/Twist "{linear: {x: 2.0, y: 0.0, z: 0.0}, angular: {x: 0.0, y: 0.0, z: 2.8}}"

3. ros2 topic pub /turtle1/cmd_vel geometry_msgs/msg/Twist "{linear: {x: 4.0, y: 0.0, z: 0.0}, angular: {x: 0.0, y: 0.0, z: 0.8}}"

Clip when run the first command like 
1. ros2 topic pub /turtle1/cmd_vel geometry_msgs/msg/Twist "{linear: {x: 2.0, y: 0.0, z: 0.0}, angular: {x: 0.0, y: 0.0, z: 1.8}}"

Clip when run the second command line
2. ros2 topic pub /turtle1/cmd_vel geometry_msgs/msg/Twist "{linear: {x: 2.0, y: 0.0, z: 0.0}, angular: {x: 0.0, y: 0.0, z: 2.8}}"

Clip when run the third command line
3. ros2 topic pub /turtle1/cmd_vel geometry_msgs/msg/Twist "{linear: {x: 4.0, y: 0.0, z: 0.0}, angular: {x: 0.0, y: 0.0, z: 0.8}}"

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