how to run a command in docker container from host code example

Example 1: docker run command on container

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

Example 2: run host command from docker container

docker run --rm -v $(pwd)/mybashscript.sh:/mybashscript.sh ubuntu bash /mybashscript.sh

Example 3: docker how to run existing container

docker start <container-name/ID>