The First Thing You Need After ros2 run
You just launched your first ROS2 node. It's running. Great. Now what?
Most tutorials stop here, leaving you staring at a terminal with no idea what your node is actually doing. Is it publishing? At what rate? What's the message structure? This is where the ROS2 command-line tools become essential — not just for debugging, but for understanding what's happening in your system at all.
I'm going to show you 15 commands that turn ROS2 from a black box into something you can actually inspect and control. These aren't just reference material — they're the tools I reach for every single time something doesn't work the way I expect.
ros2 topic list: See Every Active Topic
Start here:
ros2 topic list
This dumps every active topic in your ROS2 network. On a fresh turtlesim node (install with sudo apt install ros-humble-turtlesim if you're following along), you'll see:
/parameter_events
/rosout
/turtle1/cmd_vel
/turtle1/color_sensor
/turtle1/pose
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