anchor.diff:                  export VERBOSE=1
                   shift;;
               -u)
  -                UNPACK_ONLY=true
  +                UNPACK_ONLY=1
                   shift;;
               -f)
  -                FORCE=true
  +                FORCE=1
                   shift;;
               -y)
                   CONFIRM="y"
  
positive.code: }
  
  function unpack_payload(){
      if $FORCE || [ ! "$(ls -A $INSTALL_DIR)" ] ; then
          log "Unpacking payload . . ."
          local archive_line=$(grep -a -n -m1 '__ARCHIVE__$' $0 | sed 's/:.*//')
          tail -n +$((archive_line + 1)) $0 | tar -C $INSTALL_DIR -xf - > /dev/null || die "Failed to unpack payload from the end of '$0' into '$INSTALL_DIR'"
  
negative.code: 
      unpack_payload
  
      if [ "$UNPACK_ONLY" == "1" ] ; then
          echo "Unpacking complete, not moving symlinks or restarting because unpack only was specified."
      else
          create_symlinks
  