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Which docker-machine sub command outputs a list of commands that set environment variables which are required to make docker work with a Docker host managed by docker-machine? (Specify only the sub command without any path or parameters.)
The Docker Machine subcommand that outputs a list of commands to set the environment variables required for Docker to work with a Docker host managed by Docker Machine is 'env'. When you execute 'docker-machine env machine-name', it provides the necessary environment settings for the specified machine.
the right is env, https://docs.docker.com/machine/get-started/
https://docs.docker.com/engine/reference/commandline/run/
docker run