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The following command lists all active EMR clusters in the current region::
aws emr list-clusters --active
Output::
{
"Clusters": [
{
"Status": {
"Timeline": {
"ReadyDateTime": 1433200405.353,
"CreationDateTime": 1433199926.596
},
"State": "WAITING",
"StateChangeReason": {
"Message": "Waiting after step completed"
}
},
"NormalizedInstanceHours": 6,
"Id": "j-3SD91U2E1L2QX",
"Name": "my-cluster"
}
]
}