在数组中输出选择操作的结果-JQ [英] Output the results of select operation in an array - jq

问题描述

我有以下输入内容:

[
  {"id": "first", "val": 1}, 
  {"id": "second", "val": 2}, 
  {"id": "second", "val": 3}
]

使用jq过滤器:.[] | select(.id =="second")

Using the jq filter : .[] | select(.id == "second")

我得到以下输出:

 {
  "id": "second",
  "val": 2
 }
 {
  "id": "second",
  "val": 3
 }

我想以数组形式获取结果.是否可以在数组中获得select操作的多个结果值?

I want to get the result in the form of an array. Is it possible to get the multiple result values of select operation in an array?

推荐答案

是；将过滤器包装在一个数组中:)

Yes; wrap the filter in an array :)

$ jq '[.[] | select(.id == "second")]' tmp.json
[
  {
    "id": "second",
    "val": 2
  },
  {
    "id": "second",
    "val": 3
  }
]

或者，使用预定义为[.[] | ...]的map/1.

Or, use map/1, which is predefined as [.[] | ...].

$ jq 'map(select(.id == "second"))' tmp.json
[same result]

---

要将结果包装在bash数组中，请使用-c选项在一行上输出每个结果，并使用readarray读取结果.

---

To wrap the results in a bash array, use the -c option to output each result on a single line, and read the result with readarray.

$ readarray -t arr < <(jq -c '.[] | select(.id == "second")' tmp.json)
$ for r in "${arr[@]}"; do echo "Result: $r"; done
Result: {"id":"second","val":2}
Result: {"id":"second","val":3}

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