anchor.diff:    && rm -Rf ~/.sdkman/archives/* ~/.sdkman/tmp/* \
     && pip install chainer keras tensorflow \
     && pip3 install chainer keras tensorflow \
  -  && rbenv install 2.5.3 \
  -  && rbenv global 2.5.3 \
  +  && rbenv install 2.4.1 \
  +  && rbenv global 2.4.1 \
     && echo 'eval "$(rbenv init -)"' >> ~/.bash_profile \
  -  && bash -l -c "gem install bundler" \
  -  && bash -l ~/show_versions.sh \
  +  && bash -l -c "gem install bundler"
  +
  +RUN bash -l ~/show_versions.sh \
       "ant -version | head -n 1" \
       "ceylon -v | head -n 1" \
       "clang --version | head -n 1" \
       "clisp --version | head -n 1" \
       "coffee -v | head -n 1" \
  +    "crystal -v | head -n 1" \
       "dmcs --version | head -n 1" \
       "dmd --version | head -n 1" \
       "erl +V 2>&1 | head -n 1" \
  
positive.code: FROM ubuntu:18.04
  MAINTAINER Kazunori Sakamoto
  
  RUN apt-get update \
    && apt-get dist-upgrade -y \
    && apt-get install -y build-essential curl wget dirmngr zip unzip dos2unix \
    && curl -sL https://deb.nodesource.com/setup_10.x | bash - \
    && wget http://master.dl.sourceforge.net/project/d-apt/files/d-apt.list -O /etc/apt/sources.list.d/d-apt.list \
    && apt-key adv --keyserver hkp://p80.pool.sks-keyservers.net --recv-keys EBCF975E5BA24D5E \
    && apt-get update \
    && apt-get -y --allow-unauthenticated install --reinstall d-apt-keyring \
    && apt-get update \
  
negative.code:     "pip list" \
      "pip3 list" \
      > ~/show_versions \
    && cat ~/show_versions
  