
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,下面为大家详细讲解一下Linux jq命令使用方法。
[root@test-dhcp ~]# yum install jq
[root@test-dhcp ~]# jq -n {a:1} { "a": 1 } [root@test-dhcp ~]# jq -n '{a:"test"}' { "a": "test" }
[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" }
[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" }
[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 } }
[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.dd 5 [root@test-dhcp ~]# echo '{"a":1,"b":2}' |jq '[.a,.b]' [ 1, 2 ]
[root@test-dhcp ~]# echo "{}" |jq -r type object [root@test-dhcp ~]# echo '[0, false, [], {}, null, "hello"]' |jq 'map(type)' [ "number", "boolean", "array", "object", "null", "string" ]
[root@test-dhcp ~]# echo [1,2,3] |jq .[1] 2 [root@test-dhcp ~]# echo [1,2,3] |jq .[2] 3
[root@test-dhcp ~]# echo [1,2,3,9] |jq '.|length' 4 [root@test-dhcp ~]# echo [1,2,3] |jq '.|length' 3
[root@test-dhcp ~]# echo [1,2,3] |jq '. + [4,5,6]' [ 1, 2, 3, 4, 5, 6 ]
[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"
[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.json liuxin,30,male jiaweiqiang,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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