title: Changing the default command of base docker images
body: <p>I downloaded the ubuntu base image from the docker hub. Now I am trying to build a new image based on the ubuntu image. However, I want the default command for the ubuntu image to be "/bin/bash -c" instead of "/bin/sh" so as when I use RUN in my Dockerfile, it accesses bash instead of sh. Notice I am talking about the default command of the same image, not the image I am trying to build.</p>