anchor.diff:      "swipl --version | head -n 1" \
       "tsc -v | head -n 1" \
       "xbuild --verison | head -n 1" \
  -    > /home/aicomp/show_versions \
  -  && cat /home/aicomp/show_versions \
  -  && rm -rf /home/aicomp/show_versions.sh /home/aicomp/show_versions
  +    > ~/show_versions \
  +  && cat ~/show_versions \
  +  && rm -rf ~/show_versions.sh ~/show_versions
  
positive.code:     mono-xbuild \
      nodejs \
      ocaml-nox \
      python \
      python3 \
      perl \
      php \
      swi-prolog \
      ruby \
      rustc \
    && apt-get clean -y \
    && npm install -g \
  
negative.code:     "erl +V 2>&1 | head -n 1" \
      "gcc --version | head -n 1" \
      "gdc --version | head -n 1" \
  	"gem -v | head -n 1" \
      "ghc --version | head -n 1" \
      "g++ --version | head -n 1" \
      "go version | head -n 1" \
  