Command option Sample:aws greengrass list-core-definitions

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Retrieves a list of core definitions.Show details from next link. https://docs.aws.amazon.com/ja_jp/cli/latest/reference/greengrass/list-core-definitions.html

aws greengrass list-core-definitions \
    UpdateCoreDefinition - AWS Greengrass : http://docs.aws.amazon.com/greengrass/latest/apireference/-greengrass-definition-cores.html

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