very nice tool to upload files to dropbox over dropbox-api.
just register the app and you can upload data from the command line.
The syntax is quite simple:
./dropbox_uploader.sh COMMAND [PARAMETERS]…
to upload a file
./dropbox_uploader.sh UPLOAD /home/pi/myfile.txt Private/Test
to download the same file
./dropbox_uploader.sh DOWNLOAD Private/Test/myfile.txt /home/pi