anchor.diff:  # base image
   FROM ubuntu:latest
   # update: latest package indexes needed for software installs
  -RUN apt-get -y update
  -# needed tools
  -RUN apt-get -y install curl git
  +RUN apt-get -y update && apt-get install -y \
  +    curl \
  +    git \
  +    jq \
  +    python-pip \
  +    sqlite3 \
  +    software-properties-common \
  +    && rm -fr /var/lib/apt/lists/*
   
   # install Tool1: jq (sed for jSON)
  -RUN apt-get -y install jq
   # copy files needed for the Tool1 exercise
   COPY nyt.json /usr/local/opt/dsatcl/nyt.json
   
  
positive.code: RUN curl -sL https://deb.nodesource.com/setup_6.x | bash - && \
  	apt-get update && apt-get install -y nodejs && \
  	npm install npm@latest -g
  Run Echo node: $(node -v) && echo npm: $(npm -v)
  RUN npm install -g xml2json-command
  
  # install Tool 7 (Rio): requires R and some R packages
  RUN apt-get install -y software-properties-common
  RUN apt-key adv --keyserver keyserver.ubuntu.com --recv-keys E298A3A825C0D65DFD57CBB651716619E084DAB9
  RUN add-apt-repository 'deb [arch=amd64,i386] http://cran.rstudio.com/bin/linux/ubuntu xenial/'
  RUN apt-get -y update
  RUN apt-get install -y r-base
  RUN R -e "install.packages('dplyr',repos='http://cran.revolutionanalytics.com')"
  RUN R -e "install.packages('tidyr',repos='http://cran.revolutionanalytics.com')"
  RUN R -e "install.packages('sqldf',repos='http://cran.revolutionanalytics.com')"
  
  #RUN cd /tmp/data-science-at-the-command-line/tools && cp -v Rio /usr/local/bin
  
  # execute this command when the container is run
  #  i.e., start up in a bash shell
  
negative.code: RUN cp -v /tmp/json2csv-1.2.0.linux-amd64.go1.8/json2csv /usr/local/bin
  
  # install Tool3: csvkit
  RUN pip install --upgrade pip
  RUN pip install csvkit
  
  # install Tool4 (scrape), Tool6 (sample), Tool7 (Rio) (from JJ's tool set)
  RUN cd /tmp && git clone https://github.com/jeroenjanssens/data-science-at-the-command-line.git
  RUN cd /tmp/data-science-at-the-command-line/tools && cp -v scrape sample /usr/local/bin
  # Tool4 (scrape) requires two python modules
  