anchor.diff:    then
       unable_to_retrieve_package
     fi
  -elif [ $downloader == "wget" ]
  +elif [ "$downloader" = "wget" ]
   then
     #do wget stuff
     grep "ERROR 404" /tmp/stderr 2>&1 >/dev/null
  
positive.code:   exit 1
  }
  
  if [ $downloader == "curl" ]
  then
    #do curl stuff
    grep "The specified key does not exist." "$tmp_dir/$filename" 2>&1 >/dev/null
  
negative.code: 
  # Check whether a command exists - returns 0 if it does, 1 if it does not
  exists() {
    if command -v $1 >/dev/null 2>&1
    then
      return 0
    else
  