更新(2020)

我使用外部工具(例如Python)时遇到的最大问题是，你必须处理包管理器和安装它们的依赖关系。

然而，现在我们有了jq作为一个独立的静态工具，很容易通过GitHub发布和Webi (webinstall.dev/jq)跨平台安装，我建议:

Mac、Linux:

curl -sS https://webi.sh/jq | bash

Windows 10:

curl.exe -A MS https://webi.ms/jq | powershell

小抄:https://webinstall.dev/jq

原(2011)

TickTick是一个用bash编写的JSON解析器(不到250行代码)。

以下是作者在他的文章《想象一个Bash支持JSON的世界》中的片段:

#!/bin/bash
. ticktick.sh

``
  people = {
    "Writers": [
      "Rod Serling",
      "Charles Beaumont",
      "Richard Matheson"
    ],
    "Cast": {
      "Rod Serling": { "Episodes": 156 },
      "Martin Landau": { "Episodes": 2 },
      "William Shatner": { "Episodes": 2 }
    }
  }
``

function printDirectors() {
  echo "  The ``people.Directors.length()`` Directors are:"

  for director in ``people.Directors.items()``; do
    printf "    - %s\n" ${!director}
  done
}

`` people.Directors = [ "John Brahm", "Douglas Heyes" ] ``
printDirectors

newDirector="Lamont Johnson"
`` people.Directors.push($newDirector) ``
printDirectors

echo "Shifted: "``people.Directors.shift()``
printDirectors

echo "Popped: "``people.Directors.pop()``
printDirectors

你可以使用bashJson

它是Python JSON模块的包装器，可以处理复杂的JSON数据。

让我们考虑来自test.json文件的示例JSON数据

{
    "name":"Test tool",
    "author":"hack4mer",
    "supported_os":{
        "osx":{
            "foo":"bar",
            "min_version" : 10.12,
            "tested_on" : [10.1,10.13]
        },
        "ubuntu":{
            "min_version":14.04,
            "tested_on" : 16.04
        }
    }
}

下面的命令从这个示例JSON文件读取数据

./bashjson.sh test.json name

打印:测试工具

./bashjson.sh test.json supported_os osx foo

打印:酒吧

./bashjson.sh test.json supported_os osx tested_on

打印:[10.1,10.13]

这里有一种使用AWK的方法:

curl -sL 'http://twitter.com/users/username.json' | awk -F"," -v k="text" '{
    gsub(/{|}/,"")
    for(i=1;i<=NF;i++){
        if ( $i ~ k ){
            print $i
        }
    }
}'

使用Python的JSON支持，而不是使用AWK!

就像这样:

curl -s http://twitter.com/users/username.json | \
    python -c "import json,sys;obj=json.load(sys.stdin);print(obj['name']);"

macOS v12.3 (Monterey)删除了/usr/bin/python，因此对于macOS v12.3及更高版本，我们必须使用/usr/bin/python3。

curl -s http://twitter.com/users/username.json | \
    python3 -c "import json,sys;obj=json.load(sys.stdin);print(obj['name']);"

更新(2020)

我使用外部工具(例如Python)时遇到的最大问题是，你必须处理包管理器和安装它们的依赖关系。

然而，现在我们有了jq作为一个独立的静态工具，很容易通过GitHub发布和Webi (webinstall.dev/jq)跨平台安装，我建议:

Mac、Linux:

curl -sS https://webi.sh/jq | bash

Windows 10:

curl.exe -A MS https://webi.ms/jq | powershell

小抄:https://webinstall.dev/jq

原(2011)

TickTick是一个用bash编写的JSON解析器(不到250行代码)。

以下是作者在他的文章《想象一个Bash支持JSON的世界》中的片段:

#!/bin/bash
. ticktick.sh

``
  people = {
    "Writers": [
      "Rod Serling",
      "Charles Beaumont",
      "Richard Matheson"
    ],
    "Cast": {
      "Rod Serling": { "Episodes": 156 },
      "Martin Landau": { "Episodes": 2 },
      "William Shatner": { "Episodes": 2 }
    }
  }
``

function printDirectors() {
  echo "  The ``people.Directors.length()`` Directors are:"

  for director in ``people.Directors.items()``; do
    printf "    - %s\n" ${!director}
  done
}

`` people.Directors = [ "John Brahm", "Douglas Heyes" ] ``
printDirectors

newDirector="Lamont Johnson"
`` people.Directors.push($newDirector) ``
printDirectors

echo "Shifted: "``people.Directors.shift()``
printDirectors

echo "Popped: "``people.Directors.pop()``
printDirectors

对于更复杂的JSON解析，我建议使用Python jsonpath模块(Stefan Goessner) -

Install it - sudo easy_install -U jsonpath Use it - Example file.json (from http://goessner.net/articles/JsonPath) - { "store": { "book": [ { "category": "reference", "author": "Nigel Rees", "title": "Sayings of the Century", "price": 8.95 }, { "category": "fiction", "author": "Evelyn Waugh", "title": "Sword of Honour", "price": 12.99 }, { "category": "fiction", "author": "Herman Melville", "title": "Moby Dick", "isbn": "0-553-21311-3", "price": 8.99 }, { "category": "fiction", "author": "J. R. R. Tolkien", "title": "The Lord of the Rings", "isbn": "0-395-19395-8", "price": 22.99 } ], "bicycle": { "color": "red", "price": 19.95 } } } Parse it (extract all book titles with price < 10) - cat file.json | python -c "import sys, json, jsonpath; print '\n'.join(jsonpath.jsonpath(json.load(sys.stdin), 'store.book[?(@.price < 10)].title'))" Will output - Sayings of the Century Moby Dick Note: The above command line does not include error checking. For a full solution with error checking, you should create a small Python script, and wrap the code with try-except.