json - 如何使用 jq 返回此 JSON 文件的 "text"字段？

Question

我希望从这个 JSON 文件中提取 cat 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
  }
]

它的网址是 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，我得到整个文件作为返回。
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" .
运行后 curl 'https://cat-fact.herokuapp.com/facts' | jq '. | {.text}' ,
返回: (23) Failed writing body 运行后 curl 'https://cat-fact.herokuapp.com/facts' | jq '.[] | {text: .commit.text}' ,
这是返回的:

 % 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

我会使用数组/对象值迭代器 .[]然后 ["text"]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)从中获得的确切输出:

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