anchor.diff:  
       unpack_payload
   
  -    if [[ -n $UNPACK_ONLY ]] ; then
  +    if [ "$UNPACK_ONLY" == "1" ] ; then
           echo "Unpacking complete, not moving symlinks or restarting because unpack only was specified."
       else
           create_symlinks
  
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:                 export VERBOSE=1
                  shift;;
              -u)
                  UNPACK_ONLY=1
                  shift;;
              -f)
                  FORCE=1
                  shift;;
              -y)
                  CONFIRM="y"
  