jq命令帮助我们很方便地在终端查看和处理json文件
jq命令的帮助信息：
abby@abby:bgs$ jq -h jq - commandline JSON processor [version 1.5-1-a5b5cbe] Usage: jq [options] <jq filter> [file...] jq is a tool for processing JSON inputs, applying the given filter to its JSON text inputs and producing the filter‘s results as JSON on standard output. The simplest filter is ., which is the identity filter, copying jq‘s input to its output unmodified (except for formatting). For more advanced filters see the jq(1) manpage ("man jq") and/or https://stedolan.github.io/jq Some of the options include: -c compact instead of pretty-printed output; -n use `null` as the single input value; -e set the exit status code based on the output; -s read (slurp) all inputs into an array; apply filter to it; -r output raw strings, not JSON texts; -R read raw strings, not JSON texts; -C colorize JSON; -M monochrome (don‘t colorize JSON); -S sort keys of objects on output; --tab use tabs for indentation; --arg a v set variable $a to value <v>; --argjson a v set variable $a to JSON value <v>; --slurpfile a f set variable $a to an array of JSON texts read from <f>; See the manpage for more options.
使用：
$ jq . xxx.json # 直接将文件名传给 jq $ cat bgs_enterprise_info_norm.json | jq . #或者由其他命令读出文件内容，并传给 jq
例子：
原始数据：
abby@abby:bgs$ head -n2 bgs_enterprise_info_norm.json {"industry": "纺织服装、服饰业", "name": "xxx公司", "business": "xxxxx", "description": "空值"} {"industry": "批发业", "name": "xxx公司", "business": "xxxxx", "description": "空值"}
格式化：
abby@abby:bgs$ head -n2 bgs_enterprise_info_norm.json | jq . { "industry": "纺织服装、服饰业", "name": "xxx公司", "business": "xxxxx", "description": "空值" } { "industry": "批发业", "name": "xxx公司", "business": "xxxxx", "description": "空值" }
选取某属性：
abby@abby:bgs$ head -n2 bgs_enterprise_info_norm.json | jq .industry "纺织服装、服饰业" "批发业"
abby@abby:bgs$ jq .description bgs_enterprise_info_norm.json | grep 空值 | wc -l 2770786
参考：
原文：http://www.cnblogs.com/bymo/p/7484023.html