docker interactive shell
docker exec -it [containerid/name] [shell]
#Example
docker exec -it fa80b69 bash
#if its an apline container use "sh" instead of "bash"
how to bash into docker container
docker exec -it nginx /bin/bash
run dockerfile command
docker build -t tag-name .
dockerfile execute command
$CATALINA_HOME/RUNNING.txt
dockerfile run app cmd
RUN apt-get install python3
CMD echo "Hello world"
ENTRYPOINT echo "Hello world"