entrypoint docker what is code example

Example 1: CMD or Entrypoint in Docker

FROM ubuntu:trusty
CMD ["/bin/ping","localhost"]

Example 2: CMD or Entrypoint in Docker

$ docker run -d demo
15bfcddb11b5cde0e230246f45ba6eeb1e6f56edb38a91626ab9c478408cb615

$ docker ps -l
CONTAINER ID IMAGE COMMAND CREATED
15bfcddb4312 demo:latest "/bin/sh -c 'ping localhost'" 2 seconds ago