如何使用 jq return 此 JSON 文件的 "text" 字段？

Question

我想从这个 JSON 文件中提取猫的事实：

[
  {
    "status": {
      "verified": true,
      "feedback": "",
      "sentCount": 1
    },
    "_id": "5887e1d85c873e0011036889",
    "user": "5a9ac18c7478810ea6c06381",
    "text": "Cats make about 100 different sounds. Dogs make only about 10.",
    "__v": 0,
    "source": "user",
    "updatedAt": "2020-09-03T16:39:39.578Z",
    "type": "cat",
    "createdAt": "2018-01-15T21:20:00.003Z",
    "deleted": false,
    "used": true
  },
  {
    "status": {
      "verified": true,
      "sentCount": 1
    },
    "_id": "588e746706ac2b00110e59ff",
    "user": "588e6e8806ac2b00110e59c3",
    "text": "Domestic cats spend about 70 percent of the day sleeping and 15 percent of the day grooming.",
    "__v": 0,
    "source": "user",
    "updatedAt": "2020-08-26T20:20:02.359Z",
    "type": "cat",
    "createdAt": "2018-01-14T21:20:02.750Z",
    "deleted": false,
    "used": true
  },
  {
    "status": {
      "verified": true,
      "sentCount": 1
    },
    "_id": "58923f2fc3878c0011784c79",
    "user": "5887e9f65c873e001103688d",
    "text": "I don't know anything about cats.",
    "__v": 0,
    "source": "user",
    "updatedAt": "2020-08-23T20:20:01.611Z",
    "type": "cat",
    "createdAt": "2018-02-25T21:20:03.060Z",
    "deleted": false,
    "used": false
  },
  {
    "status": {
      "verified": true,
      "sentCount": 1
    },
    "_id": "5894af975cdc7400113ef7f9",
    "user": "5a9ac18c7478810ea6c06381",
    "text": "The technical term for a cat’s hairball is a bezoar.",
    "__v": 0,
    "source": "user",
    "updatedAt": "2020-11-25T21:20:03.895Z",
    "type": "cat",
    "createdAt": "2018-02-27T21:20:02.854Z",
    "deleted": false,
    "used": true
  },
  {
    "status": {
      "verified": true,
      "sentCount": 1
    },
    "_id": "58e007cc0aac31001185ecf5",
    "user": "58e007480aac31001185ecef",
    "text": "Cats are the most popular pet in the United States: There are 88 million pet cats and 74 million dogs.",
    "__v": 0,
    "source": "user",
    "updatedAt": "2020-08-23T20:20:01.611Z",
    "type": "cat",
    "createdAt": "2018-03-01T21:20:02.713Z",
    "deleted": false,
    "used": false
  }
]

它的url是https://cat-fact.herokuapp.com/facts。我知道访问信息不是问题，因为当我运行 curl 'https://cat-fact.herokuapp.com/facts' | jq '.' 时，我在 return.

中获得了整个文件

宁运行后curl 'https://cat-fact.herokuapp.com/facts' | jq '. | {text}',

我收到错误 jq: error (at <stdin>:0): Cannot index array with string "text"。

宁运行后curl 'https://cat-fact.herokuapp.com/facts' | jq '. | {.text}',

这是return编辑的：(23) Failed writing body

宁运行后curl 'https://cat-fact.herokuapp.com/facts' | jq '.[] | {text: .commit.text}',

这是returned:

 % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
Dload  Upload   Total   Spent    Left  Speed                                           100  1675
100  1675    0     0   9463      0 --:--:-- --:--:-- --:--:--  9463
{
"text": null
}
{
"text": null
}
{
"text": null
}
{
"text": null
}
{ 
"text": null
}

Answer 1

我会使用 array/object 值迭代器 .[] 然后 ["text"] 来过滤：

jq '.[]["text"]'

给你示例文件作为输入会产生这个输出：

"Cats make about 100 different sounds. Dogs make only about 10."
"Domestic cats spend about 70 percent of the day sleeping and 15 percent of the day grooming."
"I don't know anything about cats."
"The technical term for a cat’s hairball is a bezoar."
"Cats are the most popular pet in the United States: There are 88 million pet cats and 74 million dogs."

以上也是您（当前）从以下位置获得的确切输出：

curl -s 'https://cat-fact.herokuapp.com/facts' | jq '.[]["text"]'

如何使用 jq return 此 JSON 文件的 "text" 字段？

How do I return the "text" field of this JSON file with jq?

linux

ubuntu

json

jq