Docker build

Docker ps

docker ps list containers on your system.
A simple docker ps will only list all running containers, whereas for example a docker ps -a will list you all containers (including exited).
It will provide you with crucial informations regarding your containers like the CONTAINER ID, which is especially useful for accessing your container(s).

CONTAINER ID        IMAGE               COMMAND                  CREATED             STATUS                   PORTS               NAMES
ee49f9048356        container1        "/bin/bash"              7 weeks ago         Up 7 weeks                                     spooky_ghost
5999014fd133        container2        "/bin/sh -c 'python3…"   7 weeks ago         Up 7 weeks                                     ghastly_cats

Reference

Usage:  docker ps [OPTIONS]

List containers

Options:
  -a, --all             Show all containers (default shows just running)
  -f, --filter filter   Filter output based on conditions provided
      --format string   Pretty-print containers using a Go template
  -n, --last int        Show n last created containers (includes all states) (default -1)
  -l, --latest          Show the latest created container (includes all states)
      --no-trunc        Don't truncate output
  -q, --quiet           Only display numeric IDs
  -s, --size            Display total file sizes

Documentation