如何使用 shell 脚本从 json 响应中提取值

Question

{"expand":"renderedFields,names,schema,operations,editmeta,changelog,versionedRepresentations","id":"15114","self":"https://brg-jira-tst.state.mi.us/rest/api/2/issue/15114","key":"BRGTEST-11","fields":{"issuetype":{"self":"https://brg-jira-tst.state.mi.us/rest/api/2/issuetype/10200","id":"10200","description":"A task that needs to be done associated with Bridges project","iconUrl":"https://brg-jira-tst.state.mi.us/secure/viewavatar?size=xsmall&avatarId=10318&avatarType=issuetype","name":"Task","subtask":false,"avatarId":10318},"customfield_11500":"QAT"}}

以上是我存储在 a.json 中的 json 响应

我想使用 shell 脚本从这个 a.json 响应中提取 customfield_11500 的值。怎么做

在这种情况下，我的 shell 命令的输出必须给出结果为“QAT”

---

不喜欢滚动的格式化 JSON：

{
  "expand": "renderedFields,names,schema,operations,editmeta,changelog,versionedRepresentations",
  "id": "15114",
  "self": "https://brg-jira-tst.state.mi.us/rest/api/2/issue/15114",
  "key": "BRGTEST-11",
  "fields": {
    "issuetype": {
      "self": "https://brg-jira-tst.state.mi.us/rest/api/2/issuetype/10200",
      "id": "10200",
      "description": "A task that needs to be done associated with Bridges project",
      "iconUrl": "https://brg-jira-tst.state.mi.us/secure/viewavatar?size=xsmall&avatarId=10318&avatarType=issuetype",
      "name": "Task",
      "subtask": false,
      "avatarId": 10318
    },
    "customfield_11500": "QAT"
  }
}

Answer 1

基于这篇文章 并使用格式化的 json 文件

grep -oP '(?<="customfield_11500": ")[^"]*' a.json

Answer 2

使用最新版本的ksh93shell（v-或更高版本）：

read -m json j < file.json &&
  print -r -- "${j.fields.customfield_11500}"

或者使用广泛可用的（尽管默认情况下通常不安装）jqjson 处理器工具：

jq -r '.fields.customfield_11500' file.json