如何使用命令行计算 JSON 对象中的项目？

How to count items in JSON object using command line?

提问by édouard Lopez

I'm getting this kind of JSONreply from a curlcommand:

我JSON从一个curl命令得到这样的答复：

[
  {
    "cid": 49,
    "pyn": "yi4",
    "hans": "亿",
    "hant": "億",
    "tid": 68,
    "l10n": "cent million",
    "pid": 1,
    "pos": "num",
    "pos_txt": ""
  },
  {
    "cid": 50,
    "pyn": "yi4",
    "hans": "亿",
    "hant": "億",
    "tid": 69,
    "l10n": "100 millions",
    "pid": 1,
    "pos": "num",
    "pos_txt": ""
  }
]

How can I count the number of items in the array (here 2), using Bashor a command line (e.g. underscore) ?

如何2使用Bash或 命令行（例如underscore）计算数组（此处）中的项目数？

回答by Ken

Just throwing another solution in the mix...

只是在混合中加入另一个解决方案......

Try jq, a lightweight and flexible command-line JSON processor:

Try jq，一个轻量级且灵活的命令行 JSON 处理器：

jq length /tmp/test.json

Prints the length of the array of objects.

打印对象数组的长度。

回答by nikolay

The shortest expression is

最短的表达是

curl 'http://…' | jq length

回答by édouard Lopez

A simple solution is to install jshonlibrary :

一个简单的解决方案是安装jshon库：

jshon -l < /tmp/test.json
2