Grive options:
  -h [ --help ]         Produce help message
  -v [ --version ]      Display Grive version
  -a [ --auth ]         Request authorization token
  -p [ --path ] arg     Path to sync
  -s [ --dir ] arg      Subdirectory to sync
  -V [ --verbose ]      Verbose mode. Enable more messages than normal.
  --log-xml             Log more HTTP responses as XML for debugging.
  --new-rev             Create new revisions in server for updated files.
  -d [ --debug ]        Enable debug level messages. Implies -v.
  -l [ --log ] arg      Set log output filename.
  -f [ --force ]        Force grive to always download a file from Google Drive
                        instead of uploading it.
  --dry-run             Only detect which files need to be uploaded/downloaded,
                        without actually performing them.