What does the command `docker system prune` do?

The command docker system prune is specifically designed to clean up the Docker environment by removing all unused data, which includes not only containers but also networks, images, and volumes that are not currently being utilized. This command helps free up disk space and keep the Docker environment tidy by eliminating various types of unused objects that may accumulate over time.

When invoked, the command operates on the principle that regular maintenance is vital for optimal performance and efficiency of Docker, especially in development and testing environments, where numerous containers and images may be created and discarded. The command can be especially useful when dealing with disk space limitations or when trying to maintain a clean workspace.

While the other options mention different aspects of Docker management, they do not accurately describe the comprehensive function of docker system prune. For example, the option about removing all running containers would not reflect the command’s focus on unused data, as running containers are not targeted by this command. Similarly, shutting down all Docker services and consolidating container networks are actions unrelated to the cleanup functionality that docker system prune offers.