How do I run a linux command inside a docker container?

[petulia3478]

To run a linux command inside a docker container:

 --rm      Automatically remove the container when it exits

$ sudo docker run --rm centos:7 echo "hello world"
hello world

It ran the command inside a docker container, displayed the output and finished. While it ran it was self contained, After the command finished running the container was automatically removed.