使用 JQ Select 后 JQ 编辑文件到位答案

【问题标题】：JQ edit file in place after using JQ Select使用 JQ Select 后 JQ 编辑文件到位
【发布时间】：2018-07-30 09:17:03
【问题描述】：

在 sed 中使用 JQ 就地编辑 json 文件，例如 -i，我找到了许多解决方案，例如

jq ... input.json > tmp.json && mv tmp.json input.json

这可行，但我需要过滤我的文件，添加一些数据，然后将其放回原始文件。（即更新文件中的特定对象）

我的文件包含 1000 多个具有不同 Element 的对象。我将始终在Element 上使用过滤器，我为提问而缩短了。我有一个示例文件original.json ...

{
  "Element": "acton",
  "objectName": "contacts",
  "Path": "/contacts",
  "Scenario": "",
  "serviceLevel": "",
  "IBM": "",
  "Gap": "",
  "clientPhase": "",
  "parentPhase": "",
  "existsToday": ""
}
{
  "Element": "acton",
  "objectName": "optouts",
  "Path": "/optouts",
  "Scenario": "",
  "serviceLevel": "",
  "IBM": "",
  "Dependency": "",
  "Gap": "",
  "clientPhase": "",
  "parentPhase": "",
  "existsToday": ""
}
{
  "Element": "acton",
  "objectName": "subscriptionTypes",
  "Path": "/subscription-types",
  "Scenario": "",
  "serviceLevel": "",
  "IBM": "",
  "Dependency": "",
  "Gap": "",
  "clientPhase": "",
  "parentPhase": "",
  "existsToday": ""
}

我想通过objectName 过滤contacts 将一些数据添加到空IBM 字段并保存到文件中

应用相同的逻辑在包含 "objectName": "contacts" 的对象上将 IBM 字段就地编辑为 "Y"

jq 'select(.objectName == "contacts") | .IBM = "Y"' original.json > tmpjson.json && mv tmpjson.json original.json

现在我的文件original.json 显示

{
  "Element": "acton",
  "objectName": "contacts",
  "Path": "/contacts",
  "Scenario": "",
  "serviceLevel": "",
  "IBM": "Y",
  "Dependency": "",
  "Gap": "",
  "clientPhase": "",
  "parentPhase": "",
  "existsToday": ""
}

预期结果

{
  "Element": "acton",
  "objectName": "contacts",
  "Path": "/contacts",
  "Scenario": "",
  "serviceLevel": "",
  "IBM": "Y",
  "Gap": "",
  "clientPhase": "",
  "parentPhase": "",
  "existsToday": ""
}
{
  "Element": "acton",
  "objectName": "optouts",
  "Path": "/optouts",
  "Scenario": "",
  "serviceLevel": "",
  "IBM": "",
  "Dependency": "",
  "Gap": "",
  "clientPhase": "",
  "parentPhase": "",
  "existsToday": ""
}
{
  "Element": "acton",
  "objectName": "subscriptionTypes",
  "Path": "/subscription-types",
  "Scenario": "",
  "serviceLevel": "",
  "IBM": "",
  "Dependency": "",
  "Gap": "",
  "clientPhase": "",
  "parentPhase": "",
  "existsToday": ""
}

使用 select 后，我似乎无法再使用提供的解决方案 https://github.com/stedolan/jq/wiki/FAQ#general-questions

【问题讨论】：

@peak 我知道这些问题有诀窍

标签： json bash filtering jq edit-in-place

【解决方案1】：

您的 jq 过滤器不是您需要的，因为 select 选择。即过滤掉不符合选择条件的对象。

这个 jq 过滤器应该做你想做的事：

if (.objectName == "contacts") then .IBM = "Y" else . end

至于覆盖文件，许多有权访问sponge（CLI 实用程序moreutils 集合的一部分）的人都会使用它，例如

jq 'if (.objectName == "contacts") then .IBM = "Y" else . end' input.json |
  sponge input.json

【讨论】：