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**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*.