name : list-task-definition-families.rst **Example 1: To list the registered task definition families** The following ``list-task-definition-families`` example lists all of the registered task definition families. :: aws ecs list-task-definition-families Output:: { "families": [ "node-js-app", "web-timer", "hpcc", "hpcc-c4-8xlarge" ] } **Example 2: To filter the registered task definition families** The following ``list-task-definition-families`` example lists the task definition revisions that start with "hpcc". :: aws ecs list-task-definition-families --family-prefix hpcc Output:: { "families": [ "hpcc", "hpcc-c4-8xlarge" ] } For more information, see `Task Definition Parameters <https://docs.aws.amazon.com/AmazonECS/latest/developerguide/task_definition_parameters.html#family>`_ in the *Amazon ECS Developer Guide*.