Build and run a docker image, then open a bash shell inside the running container

build-run-docker.sh

#!/bin/bash
docker stop $(docker ps -a -q)                                # Stop and close any running docker containers
docker rm $(docker ps -a -q) 
docker build -t myapp .                                       # Build and run the container
docker run --name mydockerapp -d -p 80:80 myapp
docker exec -it mydockerapp bash                              # Open a bash terminal on the running container

To exit the bash shell just type exit. Next time you run the script the old running container will be shutdown before being rebuilt and started again.