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chore: updated notes with the last findings and experiments

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Michele Cereda
2023-04-19 23:19:02 +02:00
parent 66bebca693
commit c25bbd7e3f
3 changed files with 50 additions and 15 deletions
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27
knowledge base/jq.md
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@@ -4,22 +4,33 @@
```sh
# Only list keys.
jq 'keys' file.json
jq 'keys' 'file.json'
# Sort all the keys.
jq --sort-keys '.' input.json > output.json
jq --sort-keys '.' 'input.json' > 'output.json'
jq --sort-keys '.' 'file.json' | sponge 'file.json'
# Add a key.
# Do not fail due to possibly missing keys.
# Postfix operator '?'.
jq '.spec.template.spec.containers[]?.env?' 'manifest.kube.json'
# Add keys.
jq --arg REGION ${AWS_REGION} '.spec.template.spec.containers[]?.env? += [{name: "AWS_REGION", value: $REGION}]' /tmp/service.kube.json
# Delete a key.
# Delete keys.
jq 'del(.items[].spec.clusterIP)' /tmp/service.kube.json
# Change a value.
# Print objects as 'key [space] "value"' pairs.
jq -r 'to_entries[] | "\(.key) \"\(.value)\""' 'file.json'
# Change single values.
# A.K.A. update values.
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
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
@@ -33,10 +44,8 @@ jq '.extensionsGallery + {
itemUrl: "https://marketplace.visualstudio.com/items"
}' /usr/lib/code/product.json
# Add elements from an array from another file.
# Add elements from arrays from other files.
jq '.rules=([input.rules]|flatten)' starting-rule-set.json ending-rule-set.json
# Add elements from an array from multiple files.
jq '.rules=([inputs.rules]|flatten)' starting-rule-set.json parts/*.json
# Put specific keys on top.