BAEL-3372 - Guide to Linux jq command for JSON formatting (#8138)

* BAEL-3132 - Linux Commands - Loop Through Directories/Folders

* BAEL-3132 - Linux Commands - Loop Through Directories/Folders
- update pom description.

* BAEL-3132 - Linux Commands - Loop Through Directories/Folders
- Add another example using find exec.

* BAEL-3132 - Linux Commands - Loop Through Directories/Folders

* BAEL-3110 - Linux Commands - Remove All Text After X

* BAEL-3372 - Guide to Linux jq command for JSON formatting
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Jonathan Cook 2019-11-03 16:54:32 +01:00 committed by maibin
parent f7d3b00ab3
commit 376046ee8d
4 changed files with 96 additions and 0 deletions

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{"fruit":{"name":"apple","color":"green","price":1.20}}

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[
{
"name": "apple",
"color": "green",
"price": 1.2
},
{
"name": "banana",
"color": "yellow",
"price": 0.5
},
{
"name": "kiwi",
"color": "green",
"price": 1.25
}
]

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#!/bin/bash
#3.1. Beautify JSON
echo '{"fruit":{"name":"apple","color":"green","price":1.20}}' | jq '.'
jq '.' fruit.json
curl http://api.open-notify.org/iss-now.json | jq '.'
#3.2. Accessing Properties
jq '.fruit' fruit.json
jq '.fruit.color' fruit.json
jq '.fruit.color,.fruit.price' fruit.json
echo '{ "with space": "hello" }' | jq '."with space"'
#4.1. Iteration
echo '["x","y","z"]' | jq '.[]'
jq '.[] | .name' fruits.json
jq '.[].name' fruits.json
#4.2. Accessing By Index
jq '.[1].price' fruits.json
#4.3. Slicing
echo '[1,2,3,4,5,6,7,8,9,10]' | jq '.[6:9]'
echo '[1,2,3,4,5,6,7,8,9,10]' | jq '.[:6]' | jq '.[-2:]'
#5.1. Getting Keys
jq '.fruit | keys' fruit.json
#5.2. Returning the Length
jq '.fruit | length' fruit.json
jq '.fruit.name | length' fruit.json
#5.3. Mapping Values
jq 'map(has("name"))' fruits.json
jq 'map(.price+2)' fruits.json
#5.4. Min and Max
jq '[.[].price] | min' fruits.json
jq '[.[].price] | max' fruits.json
#5.5. Selecting Values
jq '.[] | select(.price>0.5)' fruits.json
jq '.[] | select(.color=="yellow")' fruits.json
jq '.[] | select(.color=="yellow" and .price>=0.5)' fruits.json
#5.6. Support For RegEx
jq '.[] | select(.name|test("^a.")) | .price' fruits.json
#5.7. Find Unique Values
jq 'map(.color) | unique' fruits.json
#5.8. Deleting Keys From JSON
jq 'del(.fruit.name)' fruit.json
# 6. Transforming
jq '.query.pages | [.[] | map(.) | .[] | {page_title: .title, page_description: .extract}]' wikipedia.json

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{
"query": {
"pages": [
{
"21721040": {
"pageid": 21721040,
"ns": 0,
"title": "Stack Overflow",
"extract": "Some interesting text about Stack Overflow"
}
},
{
"21721041": {
"pageid": 21721041,
"ns": 0,
"title": "Baeldung",
"extract": "A great place to learn about Java"
}
}
]
}
}