Bitcoin server port
You should see the output Bitcoin server starting before being returned to the prompt. Also refer to this StackExchange question: First create a new directory and cd into it.
To have Docker clean up the container when it exits, use the --rm flag. Also refer to this StackExchange question: This should return the same result as the getinfo command issued bitcoin server port within the Bitcoin server port container. Find out more at the official site: You should see the output Bitcoin server starting before being returned to the prompt.
Docker is bitcoin server port software container technology. This should return the same result as the getinfo command issued earlier within the Docker container. The basic commands are shown here, but I encourage you to read and follow the documentation.