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**To modify a channel** The following ``update-channel`` example modifies the settings for the specified channel. :: aws iotanalytics update-channel \ --cli-input-json file://update-channel.json Contents of ``update-channel.json``:: { "channelName": "mychannel", "retentionPeriod": { "numberOfDays": 92 } } This command produces no output. For more information, see `UpdateChannel <https://docs.aws.amazon.com/iotanalytics/latest/APIReference/API_UpdateChannel.html>`__ in the *AWS IoT Analytics API Reference*.