## Comments

    # These are the comments for a dockerfile.
    # I want to make sure $(variables) don't break out,
    # and we shouldn't see keywords like ADD or ENTRYPOINT

    # I also want to make sure that this "string" and this 'string' don't break out.

## Full example

    # Nginx
    #
    # VERSION               0.0.1

    FROM      ubuntu
    MAINTAINER Victor Vieux <victor@docker.com>

    LABEL Description="This image is used to start the foobar executable" Vendor="ACME Products" Version="1.0"
    RUN apt-get update && apt-get install -y inotify-tools nginx apache2 openssh-server

    # Firefox over VNC
    #
    # VERSION               0.3

    FROM ubuntu

    # Install vnc, xvfb in order to create a 'fake' display and firefox
    RUN apt-get update && apt-get install -y x11vnc xvfb firefox
    RUN mkdir ~/.vnc
    # Setup a password
    RUN x11vnc -storepasswd 1234 ~/.vnc/passwd
    # Autostart firefox (might not be the best way, but it does the trick)
    RUN bash -c 'echo "firefox" >> /.bashrc'

    EXPOSE 5900
    CMD    ["x11vnc", "-forever", "-usepw", "-create"]

    # Multiple images example
    #
    # VERSION               0.1

    FROM ubuntu
    RUN echo foo > bar
    # Will output something like ===> 907ad6c2736f

    FROM ubuntu
    RUN echo moo > oink
    # Will output something like ===> 695d7793cbe4

    # You᾿ll now have two images, 907ad6c2736f with /bar, and 695d7793cbe4 with
    # /oink.