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**To simulate a pipeline activity** The following ``run-pipeline-activity`` example simulates the results of running a pipeline activity on a message payload. :: aws iotanalytics run-pipeline-activity \ --pipeline-activity file://maths.json \ --payloads file://payloads.json Contents of ``maths.json``:: { "math": { "name": "MyMathActivity", "math": "((temp - 32) * 5.0) / 9.0", "attribute": "tempC" } } Contents of ``payloads.json``:: [ "{\"humidity\": 52, \"temp\": 68 }", "{\"humidity\": 52, \"temp\": 32 }" ] Output:: { "logResult": "", "payloads": [ "eyJodW1pZGl0eSI6NTIsInRlbXAiOjY4LCJ0ZW1wQyI6MjB9", "eyJodW1pZGl0eSI6NTIsInRlbXAiOjMyLCJ0ZW1wQyI6MH0=" ] } For more information, see `RunPipelineActivity <https://docs.aws.amazon.com/iotanalytics/latest/APIReference/API_RunPipelineActivity.html>`__ in the *AWS IoT Analytics API Reference*.