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Linux下jq命令怎么使用

发表于：2025-02-08 作者：千家信息网编辑

千家信息网最后更新 2025年02月08日，这篇文章主要介绍了Linux下jq命令怎么使用的相关知识，内容详细易懂，操作简单快捷，具有一定借鉴价值，相信大家阅读完这篇Linux下jq命令怎么使用文章都会有所收获，下面我们一起来看看吧。jq 是一

千家信息网最后更新 2025年02月08日Linux下jq命令怎么使用

这篇文章主要介绍了Linux下jq命令怎么使用的相关知识，内容详细易懂，操作简单快捷，具有一定借鉴价值，相信大家阅读完这篇Linux下jq命令怎么使用文章都会有所收获，下面我们一起来看看吧。

jq 是一个轻量级的json处理命令。可以对json数据进行分片、过滤、映射和转换。

安装。

[root@test-dhcp ~]# yum install jq

使用实例

创建

[root@test-dhcp ~]# jq -n {a:1}{ "a": 1}[root@test-dhcp ~]# jq -n '{a:"test"}'{ "a": "test"}

合并

[root@test-dhcp ~]# jq -n '{a:"test"} + {b:2}'{ "a": "test", "b": 2}[root@test-dhcp ~]# jq -n '{a:"test"} + {b:2} + {c:"testc"}'{ "a": "test", "b": 2, "c": "testc"}

删除

[root@test-dhcp ~]# cat test.json{"a": "test","b": 2, "c": "testc"}[root@test-dhcp ~]# cat test.json |jq .{ "a": "test", "b": 2, "c": "testc"}[root@test-dhcp ~]# cat test.json |jq 'del(.b)'{ "a": "test", "c": "testc"}

更新

[root@test-dhcp ~]# cat test.json{"a": "test","b": 2, "c": "testc"}[root@test-dhcp ~]# cat test.json |jq '.b="testb"'{ "a": "test", "b": "testb", "c": "testc"}[root@test-dhcp ~]# cat test.json |jq '. + {d:4}'{ "a": "test", "b": 2, "c": "testc", "d": 4}[root@test-dhcp ~]# cat test.json |jq '. + {d:4}' |jq '.d={dd:5}'{ "a": "test", "b": 2, "c": "testc", "d": {   "dd": 5 }}

查询

[root@test-dhcp ~]# cat test.json |jq .{ "a": "test", "b": 2, "c": "testc", "d": {   "dd": 5 }}[root@test-dhcp ~]# cat test.json |jq '. + {d:4}' |jq '.d={dd:5}' |jq .d.dd5[root@test-dhcp ~]# echo '{"a":1,"b":2}' |jq '[.a,.b]'[ 1, 2]

查看数据类型

[root@test-dhcp ~]# echo "{}" |jq -r typeobject[root@test-dhcp ~]# echo '[0, false, [], {}, null, "hello"]' |jq 'map(type)'[ "number", "boolean", "array", "object", "null", "string"]

查询数组中的值

[root@test-dhcp ~]# echo [1,2,3] |jq .[1]2[root@test-dhcp ~]# echo [1,2,3] |jq .[2]3

查询数组长度

[root@test-dhcp ~]# echo [1,2,3,9] |jq '.|length'4[root@test-dhcp ~]# echo [1,2,3] |jq '.|length'3

数组相加

[root@test-dhcp ~]# echo [1,2,3] |jq '. + [4,5,6]'[ 1, 2, 3, 4, 5, 6]

高级查询

[root@test-dhcp ~]# echo [1,2,3] | jq 'map(select(. >= 2))'[ 2, 3][root@test-dhcp ~]# echo [1,2,3] | jq 'map(select(. == 2))'[ 2][root@test-dhcp ~]# echo [1,2,3] | jq 'map(select(. != 2))'[ 1, 3][root@test-dhcp ~]# cat test.json[ {   "id": "0",   "model": "Intel(R)Xeon(R)CPUE5-2620v4@2.10GHz" }, {   "id": "1",   "model": "Intel(R)Xeon(R)CPUE5-2620v4@2.10GHz" }][root@test-dhcp ~]# cat test.json |jq .[].model"Intel(R)Xeon(R)CPUE5-2620v4@2.10GHz""Intel(R)Xeon(R)CPUE5-2620v4@2.10GHz"

类型转换

[root@test-dhcp ~]# echo '["a","b,c,d","e"]' |jq 'join(",")'"a,b,c,d,e"[root@test-dhcp ~]# echo '["a","b,c,d","e",1]' |jq 'join(",")'jq: error (at :1): string (",") and number (1) cannot be added[root@test-dhcp ~]# cat test.jsonliuxin,30,malejiaweiqiang,29,femal[root@test-dhcp ~]# jq -R 'split(",")|{"name":.[0],"age":.[1],"sex":.[2]}' ./test.json{ "name": "liuxin", "age": "30", "sex": "male"}{ "name": "jiaweiqiang", "age": "29", "sex": "femal"}[root@test-dhcp ~]# cat test.json{ "name": "liuxin", "age": "30", "sex": "male"}{ "name": "jiaweiqiang", "age": "29", "sex": "femal"}[root@test-dhcp ~]# cat test.json |jq . -c{"name":"liuxin","age":"30","sex":"male"}{"name":"jiaweiqiang","age":"29","sex":"femal"}

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