**To update a thing shadow** The following ``update-thing-shadow`` example modifies the current state of the device shadow for the specified thing and saves it to the file ``output.txt``. :: aws iot-data update-thing-shadow \ --thing-name MyRPi \ --payload "{"state":{"reported":{"moisture":"okay"}}}" \ "output.txt" The command produces no output on the display, but the following shows the contents of ``output.txt``:: { "state": { "reported": { "moisture": "okay" } }, "metadata": { "reported": { "moisture": { "timestamp": 1560270036 } } }, "version": 2, "timestamp": 1560270036 } For more information, see `Device Shadow Service Data Flow <https://docs.aws.amazon.com/iot/latest/developerguide/device-shadow-data-flow.html>`__ in the *AWS IoT Developers Guide*.