I have a JSON output from which I need to extract a few parameters in Linux.

This is the JSON output:

```
{
  items:[
    {
      provider_name:"ucp-ipg",
      subject_name:"rtm-instrumentation",
      dataset_name:"rtm-instrumentation-dataset-hour-sliced",
      dataset_key:[
        2018-03-06T06:00:00Z,
        "000394e3-a9eb-40b6-9463-fbd588d20ba4"
      ],
      record_count:21,
      state:"complete",
      version:0,
      etag:"a221df62",
      creation_timestamp:2018-03-06T06:10:46.294-00:00,
      created_by:"AAA",
      modification_timestamp:2018-03-06T06:10:46.294-00:00,
      modified_by:"AAA"
    },
    {
      provider_name:"ucp-ipg",
      subject_name:"rtm-instrumentation",
      dataset_name:"rtm-instrumentation-dataset-hour-sliced",
      dataset_key:[
        2018-03-06T06:00:00Z,
        "00097722-b02f-4938-bd4b-d935047c3837"
      ],
      record_count:17,
      state:"complete",
      version:0,
      etag:"aa4dbc25",
      creation_timestamp:2018-03-06T06:12:23.293-00:00,
      created_by:"AAA",
      modification_timestamp:2018-03-06T06:12:23.293-00:00,
      modified_by:"AAA"
    }

```

I want the output of 

```
dataset_key:[
        2018-03-06T06:00:00Z,
        "00097722-b02f-4938-bd4b-d935047c3837"
      ]

```

---

I have already tried with below but not working :

```
file.txt | python -mjson.tool | grep 'dataset_key'

```