anchor.diff:  ENV TERM linux
   RUN echo 'debconf debconf/frontend select Noninteractive' | debconf-set-selections
   
  +# ADD codewarrior user
  +RUN useradd codewarrior
  +RUN rm -rf ~codewarrior && cp -a ~root ~codewarrior && chown -R codewarrior:codewarrior ~codewarrior
   RUN apt-get install -y python python-dev python-pip python-virtualenv
   
   # Define mountable directories.
   
   # Install Node.js
  -RUN \
  -  cd /tmp && \
  -  wget http://nodejs.org/dist/node-latest.tar.gz && \
  -  tar xvzf node-latest.tar.gz && \
  -  rm -f node-latest.tar.gz && \
  -  cd node-v* && \
  -  ./configure && \
  -  CXX="g++ -Wno-unused-local-typedefs" make && \
  -  CXX="g++ -Wno-unused-local-typedefs" make install && \
  -  cd /tmp && \
  -  rm -rf /tmp/node-v* && \
  -  echo '\n# Node.js\nexport PATH="node_modules/.bin:$PATH"' >> /root/.bash_profile
  -
  +RUN add-apt-repository ppa:chris-lea/node.js
  +RUN apt-get update 
  +RUN apt-get install -y nodejs
  +RUN su codewarrior -c "echo '\n# Node.js\nexport PATH=\"/codewars/node_modules/.bin:$PATH\"' >> ~codewarrior/.bash_profile"
   
   # Define default command.
   CMD ["bash"]
  
positive.code: # Install Coffeescript
  RUN npm -g install coffee-script
  
  # Install Node testing frameworks
  RUN npm -g install chai
  RUN npm -g install mocha
  
  # Install additional node frameworks
  RUN npm install immutable
  
  # Install Lua
  RUN apt-get install -y lua5.2
  
negative.code: RUN apt-get install -y redis-server
  
  # Install Redis Language packages
  RUN npm -g install redis
  RUN gem install redis --no-ri --no-rdoc
  RUN pip install redis
  
  