JQ代替直接在文本文件（像sed -i） [英] Jq to replace text directly on file (like sed -i)

问题描述

我有需要在一定的条件下要更新一个JSON文件。

I have a json file that needs to be updated on a certain condition.

样的JSON

{
   "Actions" : [
      {
         "value" : "1",
         "properties" : {
            "name" : "abc",
            "age" : "2",
            "other ": "test1"
          }
      },
      {
         "value" : "2",
         "properties" : {
            "name" : "def",
            "age" : "3",
            "other" : "test2"
          }
      }
   ]
}

我写一个脚本，利用JQ的匹配值和更新，如下图所示。

I am writing a script that makes use of Jq to match a value and update, as shown below

cat sample.json |  jq '.Actions[] | select (.properties.age == "3") .properties.other = "no-test"'

输出（打印到终端）

Output (printed to terminal)

{
  "value": "1",
  "properties": {
    "name": "abc",
    "age": "2",
    "other ": "test1"
  }
}
{
  "value": "2",
  "properties": {
    "name": "def",
    "age": "3",
    "other": "no-test"
  }
}

虽然这个命令使所需要的变化，它输出端上的整个JSON和不作更改文件本身。

While this command makes the needed change, it outputs the entire json on the terminal and does not make change to the file itself.

请告知，如果有一个选项有JQ就直接将文件（类似于sed的-i）的变化。

Please advise if there is an option to have jq make changes on the file directly (similar to sed -i).

推荐答案

您会希望在不改变环境来更新操作对象。通过让那里的管道，你改变的背景下每一个人的行动。您可以控制​​一些括号。

You'll want to update the action objects without changing the context. By having the pipe there, you're changing the context to each individual action. You can control that with some parentheses.

$ jq --arg age "3" \
'(.Actions[] | select(.properties.age == $age).properties.other) = "no-test"' sample.json

这应该产生：

{
  "Actions": [
    {
      "value": "1",
      "properties": {
        "name": "abc",
        "age": "2",
        "other ": "test1"
      }
    },
    {
      "value": "2",
      "properties": {
        "name": "def",
        "age": "3",
        "other": "no-test"
      }
    }
  ]
}

您可以重定向结果以一个文件来替换输入文件。它不会做就地更新一个文件作为SED一样。

You can redirect the results to a file to replace the input file. It won't do in-place updates to a file as sed does.

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