bash - 使用 jq 遍历 JSON 对象

Question

这是我的 JSON 对象数组的样子:

[
    {
        "Description": "Description 1",
        "OutputKey": "OutputKey 1",
        "OutputValue": "OutputValue 1"
    },
    {
        "Description": "Description 2",
        "OutputKey": "OutputKey 2",
        "OutputValue": "OutputValue 2"
    },
    {
        "Description": "Description 3",
        "OutputKey": "OutputKey 3",
        "OutputValue": "OutputValue 3"
    },
    {
        "Description": "Description 4",
        "OutputKey": "OutputKey 4",
        "OutputValue": "OutputValue 4"
    },
    {
        "Description": "Description 5",
        "OutputKey": "OutputKey 5",
        "OutputValue": "OutputValue 5"
    },
    {
        "Description": "Description 6",
        "OutputKey": "OutputKey 6",
        "OutputValue": "OutputValue 6"
    }
]

我如何使用 jq 对此进行迭代，以便我可以在其他命令中使用 OutputKey 和 OutputValue 的值？

Answer 1

假设您的内容来自 in.json:

#!/usr/bin/env bash
case $BASH_VERSION in (""|[123].*) echo "Bash 4.0 or newer required" >&2; exit 1;; esac

declare -A values=( ) descriptions=( )

while IFS= read -r description &&
      IFS= read -r key &&
      IFS= read -r value; do
  values[$key]=$value
  descriptions[$key]=$description
  echo "Read key $key, with value $value and description $description" >&2
done < <(jq -r '.[] | (.Description, .OutputKey, .OutputValue)' <in.json)

根据您的输入，这会向 stderr 发出以下内容:

Read key OutputKey 1, with value OutputValue 1 and description Description 1
Read key OutputKey 2, with value OutputValue 2 and description Description 2
Read key OutputKey 3, with value OutputValue 3 and description Description 3
Read key OutputKey 4, with value OutputValue 4 and description Description 4
Read key OutputKey 5, with value OutputValue 5 and description Description 5
Read key OutputKey 6, with value OutputValue 6 and description Description 6

另外，这段代码运行后，你可以接着执行:

key_to_look_up="OutputKey 1"
echo "${values[$key_to_look_up]}"
echo "${descriptions[$key_to_look_up]}"

...并得到输出:

OutputValue 1
Description 1