Simple docker commands
Empty state, no images:
no runnin containers
$ docker ps CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
no local containers at all (including not running, and showing the size)
$ docker ps -as CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
not even images
$ docker images REPOSITORY TAG IMAGE ID CREATED SIZE
Commands
docker ps docker ps -as list all the containers available locally (incl the size) docker images list images