anchor.diff:  FROM ubuntu:trusty
   MAINTAINER danielpops@gmail.com
   
  -RUN apt-get update \
  +RUN apt-get update > /dev/null \
       && DEBIAN_FRONTEND=noninteractive apt-get install -y --no-install-recommends \
           alien \
           autoconf \
  
positive.code: RUN curl -O https://nmap.org/dist/$NMAP_VERSION.tar.bz2 \
      && bzip2 -cd $NMAP_VERSION.tar.bz2 | tar xvf - \
      && cd /nmap/$NMAP_VERSION/ \
      && ./configure --prefix=/ \
      && make \
      && make install \
      && rm -rf /nmap/
  
  
negative.code:         wget \
          xmltoman \
          xsltproc \
              > /dev/null \
      && apt-get clean
  
  
  