The following command retrieves the lifecycle configuration for a bucket named my-bucket:

aws s3api get-bucket-lifecycle --bucket my-bucket

Output:

{
  "Rules": [
    {
      "ID": "Move to Glacier after sixty days (objects in logs/2015/)",
      "Prefix": "logs/2015/",
      "Status": "Enabled",
      "Transition": {
        "Days": 60,
        "StorageClass": "GLACIER"
      }
    },
    {
      "Expiration": {
        "Date": "2016-01-01T00:00:00.000Z"
      },
      "ID": "Delete 2014 logs in 2016.",
      "Prefix": "logs/2014/",
      "Status": "Enabled"
    }
  ]
}