安装:yum install jq -y
文档:
https://stedolan.github.io/jq/manual/
数据源
333.json
[{
"name": "站长工具",
"url": "http://tool.chinaz.com",
"address": {
"city": "厦门",
"country": "中国"
},
"arrayBrowser": [{
"name": "Google",
"url": "http://www.google.com"
},
{
"name": "Baidu",
"url": "http://www.baidu.com"
}
]
},
{
"name": "站长之家",
"url": "http://tool.zzhome.com",
"address": {
"city": "大连",
"country": "中国"
},
"arrayBrowser": [{
"name": "360",
"url": "http://www.so.com"
},
{
"name": "bing",
"url": "http://www.bing.com"
}
],
"127.0.0.1": {
"error": 200,
"msg": "ok"
}
}
]
例子基础
haima@haima-PC:~/Desktop$ cat 333.json |jq ‘.‘
[
{
"name": "站长工具",
"url": "http://tool.chinaz.com",
"address": {
"city": "厦门",
"country": "中国"
},
"arrayBrowser": [
{
"name": "Google",
"url": "http://www.google.com"
},
{
"name": "Baidu",
"url": "http://www.baidu.com"
}
]
},
{
"name": "站长之家",
"url": "http://tool.zzhome.com",
"address": {
"city": "大连",
"country": "中国"
},
"arrayBrowser": [
{
"name": "360",
"url": "http://www.so.com"
},
{
"name": "bing",
"url": "http://www.bing.com"
}
],
"127.0.0.1": {
"error": 200,
"msg": "ok"
}
}
]
管道线 |
jq支持管道线 |,它如同linux命令中的管道线——把前面命令的输出当作是后面命令的输入。如下命令把.[0]作为{…}的输入,进而访问嵌套的属性,如.name和.address.city。
观察如下几个命令,通过改变|前后的输入和输出来达到不同的效果:
cat json.txt | jq ‘.[0] | {name:.name,city:.address.city}‘
{
"name": "站长工具",
"city": "厦门"
}
cat json.txt | jq ‘.[0] | {name:.arrayBrowser[1].name,city:.address.city}‘
{
"name": "Baidu",
"city": "厦门"
}
cat json.txt | jq ".[] | {name:.arrayBrowser[1].name,city:.address.city}"
{
"name": "Baidu",
"city": "厦门"
}
{
"name": "bing",
"city": "大连"
}
[]
如果希望把jq的输出当作一个数组,可以在前后加上[]:
cat json.txt | jq "[.[] | {name:.arrayBrowser[1].name,city:.address.city}]"
[
{
"name": "Baidu",
"city": "厦门"
},
{
"name": "bing",
"city": "大连"
}
]
自定义key
在{}中,冒号前面的名字是映射的名称,你可以任意修改,如:
```sh
cat json.txt | jq "[.[] | {name_001:.arrayBrowser[1].name,city_002:.address.city}]"
[
{
"name_001": "Baidu",
"city_002": "厦门"
},
{
"name_001": "bing",
"city_002": "大连"
}
]
原文链接:https://blog.csdn.net/qq_26502245/article/details/100191694
取0号单元下的元素
haima@haima-PC:~/Desktop$ cat 333.json |jq ‘.[0].name‘
"站长工具"
haima@haima-PC:~/Desktop$ cat 333.json |jq ‘.[0].address‘
{
"city": "厦门",
"country": "中国"
}
haima@haima-PC:~/Desktop$ cat 333.json |jq ‘.[0].address.city‘
"厦门"
haima@haima-PC:~/Desktop$ cat 333.json |jq ‘.[0].address["city"]‘
"厦门"
haima@haima-PC:~/Desktop$ cat 333.json |jq ".[0].address[\"city\"]"
"厦门"
haima@haima-PC:~/Desktop$ cat 333.json |jq ‘.[1]["127.0.0.1"]‘
{
"error": 200,
"msg": "ok"
}
haima@haima-PC:~/Desktop$ cat 333.json | jq ".[0]" | jq ‘keys‘ #获取0号单元的所有key
[
"address",
"arrayBrowser",
"name",
"url"
]
haima@haima-PC:~/Desktop$ cat 333.json | jq ".[0].address" # 获取0号单元的address
{
"city": "厦门",
"country": "中国"
}
haima@haima-PC:~/Desktop$ cat 333.json | jq ".[0].address" | jq ‘keys‘ #获取0号单元的address里的所有 key(嵌套提取)
[
"city",
"country"
]
haima@haima-PC:~/Desktop$ cat 333.json | jq ".[0]" | jq ‘has("name")‘ #判断是否有某个 key
true
haima@haima-PC:~/Desktop$ cat 333.json | jq ".[0]" | jq ‘has("test")‘ #判断是否有某个 key
false
压缩json
haima@haima-PC:~/Desktop$ cat 333.json | jq -c .
[{"name":"站长工具","url":"http://tool.chinaz.com","address":{"city":"厦门","country":"中国"},"arrayBrowser":[{"name":"Google","url":"http://www.google.com"},{"name":"Baidu","url":"http://www.baidu.com"}]},{"name":"站长之家","url":"http://tool.zzhome.com","address":{"city":"大连","country":"中国"},"arrayBrowser":[{"name":"360","url":"http://www.so.com"},{"name":"bing","url":"http://www.bing.com"}],"127.0.0.1":{"error":200,"msg":"ok"}}]