Command not found "vcs"

[siulamlu]

Hello， I am a beginner in ubuntu. When I perform "vcs import src < src/iiwa_ros2.repos", the result is "bash: src/iiwa_ros2.repos: No such file or directory". I found there is really no this file, so I change the command to "vcs import src < src/iiwa_ros2/iiwa_ros2.repos", and the result is “command not found "vcs" ”. I am confused. Will you tell me how to do about it? Thanks.