mirror of
https://gitea.com/mcereda/oam.git
synced 2026-02-09 05:44:23 +00:00
86 lines
3.2 KiB
Markdown
86 lines
3.2 KiB
Markdown
# JQ
|
|
|
|
## TL;DR
|
|
|
|
```sh
|
|
# Only list keys.
|
|
jq 'keys' file.json
|
|
|
|
# Sort all the keys.
|
|
jq --sort-keys '.' input.json > output.json
|
|
|
|
# Add a key.
|
|
jq --arg REGION ${AWS_REGION} '.spec.template.spec.containers[]?.env? += [{name: "AWS_REGION", value: $REGION}]' /tmp/service.kube.json
|
|
|
|
# Delete a key.
|
|
jq 'del(.items[].spec.clusterIP)' /tmp/service.kube.json
|
|
|
|
# Change a value.
|
|
jq '.extensionsGallery
|
|
| .serviceUrl |= "https://marketplace.visualstudio.com/_apis/public/gallery"' \
|
|
/usr/lib/code/product.json
|
|
jq --arg NAMESPACE ${NAMESPACE} '.spec.template.spec.containers[]?.env[]? |= {name: .name, value: (if .name == "KUBERNETES_NAMESPACE" then $NAMESPACE else .value end)}' /tmp/service.kube.json
|
|
|
|
# Change multiple values at once.
|
|
jq '.extensionsGallery
|
|
| .serviceUrl = "https://marketplace.visualstudio.com/_apis/public/gallery"
|
|
| .cacheUrl = "https://vscode.blob.core.windows.net/gallery/index"
|
|
| .itemUrl = "https://marketplace.visualstudio.com/items"' \
|
|
/usr/lib/code/product.json
|
|
jq '.extensionsGallery + {
|
|
serviceUrl: "https://marketplace.visualstudio.com/_apis/public/gallery",
|
|
cacheUrl: "https://vscode.blob.core.windows.net/gallery/index",
|
|
itemUrl: "https://marketplace.visualstudio.com/items"
|
|
}' /usr/lib/code/product.json
|
|
|
|
# Put specific keys on top.
|
|
jq '.objects = [(.objects[] as $in | {type,name,id} + $in)]' prod/dataPipeline_deviceLocationConversion_prod.json
|
|
|
|
# Convert Enpass' JSON export to a YAML file
|
|
jq '.items[] | {title, fields} | .title + ":", (.fields[] | select(.value != "") | " " + .label + ": " + .value)' test.json -cr
|
|
|
|
# Refactor a datapipeline definition.
|
|
jq --sort-keys '.' datapipeline.json > /tmp/sorted.json \
|
|
&& jq '.objects = [(.objects[] as $in | {type,name,id} + $in | with_entries(select(.value != null)))]' \
|
|
/tmp/sorted.json > /tmp/reordered.json \
|
|
&& mv /tmp/reordered.json datapipeline.json
|
|
|
|
# Extract the value of elements with specific keys.
|
|
kubectl get pods -o yaml \
|
|
| yq -y '
|
|
.items[]
|
|
| select(.metadata.name | test("^runner-.*"))
|
|
| select(.spec.tolerations[].key == "component" and .spec.tolerations[].value == "big-runner")
|
|
| .spec.nodeSelector, .spec.tolerations' \
|
|
-
|
|
|
|
# Recursively find all the properties whose key is 'errors' whether it exists or not.
|
|
# '..' unrolls the object, '?' checks for the value or returns null, and 'select(.)' is like a filter on truthy values.
|
|
jq '[.. | .errors?[0] | select(.) ]' /tmp/helm.template.out.json
|
|
|
|
# Find all images in a helm chart explicitly or implicitly using the tag 'latest'.
|
|
helm template chartName \
|
|
| yq -r '
|
|
..
|
|
| .image?
|
|
| select(.)
|
|
| select(.|test(".*:.*")|not), select(.|test(".*:$")), select(.|test(".*:latest"))' \
|
|
-
|
|
```
|
|
|
|
## Further readings
|
|
|
|
- [JQ recipes]
|
|
|
|
[jq recipes]: https://remysharp.com/drafts/jq-recipes
|
|
|
|
## Sources
|
|
|
|
- [Filter objects list with regex]
|
|
- [Select multiple conditions]
|
|
- [Change multiple values at once]
|
|
|
|
[change multiple values at once]: https://stackoverflow.com/questions/47355901/jq-change-multiple-values#47357956
|
|
[filter objects list with regex]: https://til.hashrocket.com/posts/uv0bjiokwk-use-jq-to-filter-objects-list-with-regex
|
|
[select multiple conditions]: https://stackoverflow.com/questions/33057420/jq-select-multiple-conditions#33059058
|