command to run Dockerfile code example

Example 1: docker run command on container

sudo docker exec -it <container name> <command>

Example 2: dockerfile run app cmd

RUN apt-get install python3
CMD echo "Hello world"
ENTRYPOINT echo "Hello world"

Example 3: create dockerfile

FROM ubuntu:18.04
COPY . /app
RUN make /app
CMD python /app/app.py