一、安装
百度brew install、apt install、yum install等
二、常用操作
1.格式化json
XX命令 | jq #比如cat a.json |jq
XX命令 | jq '' #比如cat a.json | jq ''
cat a.json | jq '' | less #如果 json 很长，则可以使用管道传给 less 命令
2.取指定字段的值
直接输入字段，使用.嵌套访问，例如要获取昨天的信息
curl -s http://t.weather.sojson.com/api/weather/city/101310215 | jq .data.yesterday
响应如下： { "date": "24", "high": "高温 29℃", "low": "低温 23℃", "ymd": "2019-10-24", "week": "星期四", "sunrise": "06:34", "sunset": "18:10", "aqi": 27, "fx": "无持续风向", "fl": "<3级", "type": "多云", "notice": "阴晴之间，谨防紫外线侵扰" }
3.过滤指定字段
使用一个json指定所有字段，如{date, high}，获取昨天的最高温度如下
curl -s http://t.weather.sojson.com/api/weather/city/101310215 | jq .data.yesterday|jq "{date,high}"
响应如下：
{
"date": "24",
"high": "高温 29℃"
}
4.获取多个字段的值
使用逗号获取多个
curl -s http://t.weather.sojson.com/api/weather/city/101310215 | jq .data.yesterday|jq ".date, .high"
响应如下： "24" "高温 29℃"
5.筛选数组
直接指定数组的索引即可
curl -s http://t.weather.sojson.com/api/weather/city/101310215 |jq ".data.forecast"|jq ".[0,9]"
响应如下：
{
"date": "25",
"high": "高温 29℃",
"low": "低温 23℃",
"ymd": "2019-10-25",
"week": "星期五",
"sunrise": "06:35",
"sunset": "18:10",
"aqi": 44,
"fx": "无持续风向",
"fl": "<3级",
"type": "中雨",
"notice": "记得随身携带雨伞哦"
}
{
"date": "03",
"high": "高温 26℃",
"low": "低温 24℃",
"ymd": "2019-11-03",
"week": "星期日",
"sunrise": "06:38",
"sunset": "18:05",
"fx": "东风",
"fl": "3-4级",
"type": "小雨",
"notice": "雨虽小，注意保暖别感冒"
}