anchor.diff:  MAINTAINER Mark McCahill "mark.mccahill@duke.edu"
   
   # get R from a CRAN archive 
  -RUN  echo    "deb http://cran.rstudio.com/bin/linux/ubuntu xenial/" >>    /etc/apt/sources.list
  -RUN DEBIAN_FRONTEND=noninteractive apt-key adv --keyserver keyserver.ubuntu.com --recv-keys  E084DAB9
  +RUN  echo    "deb http://cran.rstudio.com/bin/linux/ubuntu xenial/"    >>    /etc/apt/sources.list
  +RUN DEBIAN_FRONTEND=noninteractive apt-key adv  --keyserver keyserver.ubuntu.com --recv-keys  E084DAB9
   
   RUN apt-get  update ; \
       apt-get  dist-upgrade -y 
  
positive.code:    gdebi-core \
     libapparmor1
     
  RUN DEBIAN_FRONTEND=noninteractive wget https://download2.rstudio.org/rstudio-server-1.1.383-amd64.deb
  RUN DEBIAN_FRONTEND=noninteractive gdebi --n rstudio-server-1.1.383-amd64.deb
  RUN rm rstudio-server-1.1.383-amd64.deb
  
  # update the R packages we will need for knitr
  RUN DEBIAN_FRONTEND=noninteractive wget \
  
negative.code: RUN apt-get update ; \
     DEBIAN_FRONTEND=noninteractive apt-get  install -y  \
     r-base \
     r-base-dev \
     vim \
     less \
     net-tools \
  