After Hello World - list containers

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

$ docker container ls -a -s
$ docker container ls -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)

Older spelling for the same command:

docker container ps
docker ps

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

$ docker container ps --help