After Hello World

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no running containers, but there is one on the disk:

$ docker container ls -a -s
$ docker ps -as
CONTAINER ID        IMAGE               COMMAND             CREATED             STATUS                     PORTS               NAMES               SIZE
f6239f10a6ad        hello-world         "/hello"            8 seconds ago       Exited (0) 7 seconds ago                       lucid_snyder        0 B (virtual 1.84 kB)

• I keep fortgeting what does that -s do, so I run:

$ docker ps --help

There is also an image

$ docker images
$ docker image ls
$ docker image list
REPOSITORY          TAG                 IMAGE ID            CREATED             SIZE
hello-world         latest              48b5124b2768        6 weeks ago         1.84 kB