NAME

       gnunet-download - a command line interface for downloading files from GNUnet

SYNOPSIS

       gnunet-download [OPTIONS] -- GNUNET_URI

DESCRIPTION

       Download files from GNUnet.

       -a LEVEL, --anonymity=LEVEL
              set desired level of receiver anonymity.  Default is 1.

       -c FILENAME, --config=FILENAME
              use config file (defaults: ~/.gnunet/gnunet.conf)

       -D, --delete-incomplete
              causes  gnunet-download  to  delete  incomplete downloads when aborted with CTRL-C.
              Note that complete files that are part of an incomplete recursive download will not
              be deleted even with this option.  Without this option, terminating gnunet-download
              with a signal will cause incomplete downloads to stay on disk.  If  gnunet-download
              runs to (normal) completion finishing the download, this option has no effect.

       -h, --help
              print help page

       -L LOGLEVEL, --loglevel=LOGLEVEL
              Change  the  loglevel.   Possible  values for LOGLEVEL are ERROR, WARNING, INFO and
              DEBUG.

       -n, --no-network
              Only search locally, do not forward requests to other peers.

       -o FILENAME, --output=FILENAME
              write the file to FILENAME.  Hint: when recursively downloading a directory, append
              a  '/'  to  the  end  of  the  FILENAME  to create a directory of that name.  If no
              FILENAME is specified, gnunet-download constructs a temporary ID from  the  URI  of
              the  file.   The  final  filename is constructed based on meta-data extracted using
              libextractor (if available).

       -p DOWNLOADS, --parallelism=DOWNLOADS
              set the maximum number of  parallel  downloads  that  is  allowed.   More  parallel
              downloads  can,  to  some  extent,  improve  the  overall time to download content.
              However, parallel downloads also take more memory (see also option -r which can  be
              used  to  limit memory utilization) and more sockets.  This option is used to limit
              the number of files that are downloaded in parallel (-r can be used  to  limit  the
              number  of  blocks  that  are concurrently requested).  As a result, the value only
              matters for recursive downloads.  The default value is 32.

       -r REQUESTS, --request-parallelism=REQUESTS
              set the maximum number of parallel requests that is allowed.  If multiple files are
              downloaded,  gnunet-download  will not run them in parallel if this would cause the
              number of pending requests to possibly exceed the  given  value.   This  is  useful
              since,  for  example,  downloading dozens of multi-gigabyte files in parallel could
              exhaust memory resources and would hardly  improve  performance.    Note  that  the
              limit  only  applies to this specific process and that other download activities by
              other processes are not included in this limit.  Consider raising  this  limit  for
              large recursive downloads with many large files if memory and network bandwidth are
              not fully utilized and if the parallelism limit (-p option) is not  reached.   This
              option also only matters for recursive downloads.  The default value is 4092.

       -R, --recursive
              download  directories  recursively (and in parallel); note that the URI must belong
              to a GNUnet directory and that the filename given must end with a '/' -- otherwise,
              only  the  file corresponding to the URI will be downloaded.  Note that in addition
              to using '-R', you must also specify a filename ending in '.gnd' so that  the  code
              realizes that the top-level file is a directory (since we have no meta data).

       -v, --version
              print the version number

       -V, --verbose
              print progress information

NOTES

       The  GNUNET_URI  is  typically obtained from gnunet-search. gnunet-fs-gtk can also be used
       instead of gnunet-download.  If you ever have to abort a download, you  can  at  any  time
       continue it by re-issuing gnunet-download with the same filename. In that case GNUnet will
       not download blocks again that are already present.  GNUnet's  file-encoding  will  ensure
       file  integrity,  even  if  the  existing file was not downloaded from GNUnet in the first
       place. Temporary information will be appended to the target file  until  the  download  is
       completed.

SETTING ANONYMITY LEVEL

       The -a option can be used to specify additional anonymity constraints. If set to 0, GNUnet
       will try to download the file as fast as possible, including using non-anonymous  methods.
       If you set it to 1 (default), you use the standard anonymous routing algorithm (which does
       not explicitly leak your identity).  However, a powerful adversary may still  be  able  to
       perform  traffic  analysis  (statistics) to over time infer data about your identity.  You
       can gain better privacy by specifying a higher level of  anonymity,  which  increases  the
       amount  of  cover  traffic your own traffic will get, at the expense of performance.  Note
       that your download performance is not only determined by your  own  anonymity  level,  but
       also  by  the  anonymity  level of the peers publishing the file.  So even if you download
       with anonymity level 0, the peers publishing the data  might  be  sharing  with  a  higher
       anonymity  level,  which  in this case will determine performance.  Also, peers that cache
       content in the network always use anonymity level 1.

       This option can be used to limit requests  further  than  that.  In  particular,  you  can
       require  GNUnet to receive certain amounts of traffic from other peers before sending your
       queries. This way, you can gain very high levels of anonymity - at  the  expense  of  much
       more traffic and much higher latency. So set it only if you really believe you need it.

       The  definition  of ANONYMITY-RECEIVE is the following.  0 means no anonymity is required.
       Otherwise a value of 'v' means that 1 out of v bytes of "anonymous" traffic  can  be  from
       the  local  user,  leaving  'v-1'  bytes  of cover traffic per byte on the wire.  Thus, if
       GNUnet routes n bytes of messages from foreign peers (using  anonymous  routing),  it  may
       originate  n/(v-1)  bytes of queries in the same time-period. The time-period is twice the
       average delay that GNUnet defers forwarded queries.

       The default is 1 and this should be fine for most users.  Also notice that if  you  choose
       very  large values, you may end up having no throughput at all, especially if many of your
       fellow GNUnet-peers all do the same.

FILES

       ~/.gnunet/gnunet.conf
              GNUnet configuration file

REPORTING BUGS

       Report  bugs  to   <https://gnunet.org/bugs/>   or   by   sending   electronic   mail   to
       <gnunet-developers@gnu.org>

SEE ALSO

       gnunet-fs-gtk(1),        gnunet-publish(1),        gnunet-search(1),       gnunet.conf(5),
       gnunet-service-fs(1)