How Do You Enter a Docker Container That is Currently Running?

Problem scenario
You want to get inside a Docker container that is running.  You are on the Docker host.  What should you do?

Solution
1.  Run this command:  docker ps -a   # Find the container ID in the output
2.  Run this command but substitute abcd1234 with the container ID found above:
docker exec -it abcd1234 bash

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