For
Cloud Service access from the command line (which implies it can be scripted), try:
For non-ARM devices (FREE != ssl/tls protected connection):
https://storagemadeeasy.com/LinuxDrive/
For Kindles (should work with NiLuJe's python install but not tested):
http://s3tools.org/s3cmd
See Also:
http://xmodulo.com/2013/06/how-to-ac...-in-linux.html
Note:
Amazon still offers a FREE "starter account" on their web services system:
http://aws.amazon.com/s3/
Which includes their supercomputer (Which is running Linux, like your Kindle is):
http://www.top500.org/site/50321
Also:
http://www.top500.org/system/178321
(Yes, you can get a FREE "starter account" on that machine also.)

Maybe we should start posting our Kindle Jailbreak(s) and other things on Amazon's s3 (free) cloud with the files marked as "public".