$ docker --help

Usage:	docker COMMAND

A self-sufficient runtime for containers
Management Commands:
  container   Manage containers
  image       Manage images
  network     Manage networks
  node        Manage Swarm nodes
  plugin      Manage plugins
  secret      Manage Docker secrets
  service     Manage services
  stack       Manage Docker stacks
  swarm       Manage Swarm
  system      Manage Docker
  volume      Manage volumes

Run 'docker COMMAND --help' for more information on a command.
$ docker container --help
Usage:	docker container COMMAND

Manage containers

      --help   Print usage

  attach      Attach to a running container
  commit      Create a new image from a container's changes
  cp          Copy files/folders between a container and the local filesystem
  create      Create a new container
  wait        Block until one or more containers stop, then print their exit codes

Run 'docker container COMMAND --help' for more information on a command.
 $ docker plugin --help
 Usage:	docker plugin COMMAND
 Manage plugins
       --help   Print usage
   create      Create a plugin from a rootfs and configuration. Plugin data directory must contain config.json and rootfs directory.
   disable     Disable a plugin
   enable      Enable a plugin
   inspect     Display detailed information on one or more plugins
   install     Install a plugin
   ls          List plugins
   push        Push a plugin to a registry
   rm          Remove one or more plugins
   set         Change settings for a plugin
   upgrade     Upgrade an existing plugin

New Aliases:

$ docker container ls -a
CONTAINER ID        IMAGE               COMMAND             CREATED              STATUS                          PORTS               NAMES
66d17f3bc07e        hello-world         "/hello"            About a minute ago   Exited (0) About a minute ago                       ecstatic_lamarr 
# docker image ls
REPOSITORY          TAG                 IMAGE ID            CREATED             SIZE
fedora              latest              0047cca29c6f        5 days ago          230 MB
hello-world         latest              48b5124b2768        2 months ago        1.84 kB

New docker system command added:

# docker system df
TYPE                TOTAL               ACTIVE              SIZE                RECLAIMABLE
Images              1                   0                   1.84 kB             1.84 kB (100%)
Containers          0                   0                   0 B                 0 B
Local Volumes       0                   0                   0 B                 0 B
WARNING! This will remove:
	- all stopped containers
	- all volumes not used by at least one container
	- all networks not used by at least one container
	- all dangling images
Are you sure you want to continue? [y/N]

New prune feature added:

above all things can be achieved by using one command also,


Thanks, Happy Hacking !!!