Docker version, info and command structure

command: docker version

• To verify cli can talk to engine

command: docker info

• most config values of engine 

 docker command line structure

1. old way(still works): docker <command> (options)
2. new way: docker <command> <sub-command> (options)

In the new way, the <command> refers to management commands.
You can get a list of commands by just typing: docker on console.