$ ros2 run demo_nodes_cpp
usage: ros2 run [-h] [--prefix PREFIX] package_name executable_name ...
ros2 run: error: the following arguments are required: executable_name, argv

但是, 

$ ros2 run demo_nodes_cpp talker
$ ros2 run turtlesim turtlesim_node

均可以正常运行

ROS2 版本:

$ printenv ROS_DISTRO
humble