[linux] jq 사용법

목차

 

 

 

[json] key 로부터 value 추출

echo '{"a":1}' | jq '.["a"]'

>> 
1

 

[json] netsted json 의 value 추출

echo '{"outer-key" : {"nested-key" : true}}' | jq '.["outer-key"]'

>> 
{
  "nested-key": true
}

echo '{"outer-key" : {"nested-key" : true}}' | jq '.["outer-key"] | .["nested-key"]'

>> 
true


echo '{"outer-key" : {"nested-key" : {"inner-key": false}}}' | jq '.["outer-key"] | .["nested-key"] | .["inner-key"]' 

>>
false

 

 

[json] list 추출하기

echo '{"list" : [1,2,4,5,6,7,8,9,10]}' | jq '.["list"] | .[1]'

>> 
2


echo '{"list" : [1,2,{"key": 3}, 4,5,6,7,8,9,10]}' | jq '.["list"] | .[2]'

>> 
{
  "key": 3
}

echo '{"list" : [1,2,{"key": 3}, 4,5,6,7,8,9,10]}' | jq '.["list"] | .[2] | .["key"]'

>> 
3

 

[json] 배열 for loop

for item in $(echo '{"list": [1,2,3,4,5,6,7,8,9]}' | jq -r '.["list"] | .[]')
do
     echo $item
done

>> 
1
2
3
4
5
6
7
8
9

 

[json] key 추출하기

echo '{"a":1, "b": 2}' | jq "keys"

>>
[
  "a",
  "b"
]