diff --git a/knowledge base/jq.md b/knowledge base/jq.md
index 4cc005c..8f35c15 100644
--- a/knowledge base/jq.md	
+++ b/knowledge base/jq.md	
@@ -20,6 +20,13 @@ docker pull 'ghcr.io/jqlang/jq'
   <summary>Usage</summary>
 
 ```sh
+# Run using containers
+docker run --rm -i -v "$PWD:/workdir:ro" --workdir '/workdir' 'ghcr.io/jqlang/jq' '.' 'package.json'
+
+# Include the name of the file in the filtered output
+jq -r 'input_filename' 'package.json'
+jq '{"start":.start,"end":.end,"file":input_filename}' '/tmp/.ansible/async'/*
+
 # Only list keys.
 jq 'keys' 'file.json'
 docker run --rm -i 'ghcr.io/jqlang/jq' 'keys' 'file.json'
@@ -32,6 +39,9 @@ jq --sort-keys '.' 'file.json' | sponge 'file.json'
 # Notice the postfix operator '?'.
 jq '.spec.template.spec.containers[]?.env?' 'manifest.kube.json'
 
+# Update values of keys
+jq '.dependencies."@pulumi/aws" |= "6.57.0"' 'package.json' | sponge 'package.json'
+
 # Add elements to lists.
 jq '.orchestrators += [{"orchestratorVersion": "1.24.9"}]'
 jq --arg 'REGION' "${AWS_REGION}" \
@@ -42,7 +52,7 @@ yq -iy '.resources+=["awx.yaml"]' 'kustomization.yaml'
 # Delete keys from objects.
 jq 'del(.items[].spec.clusterIP)' '/tmp/service.kube.json'
 jq 'del(.country, .number, .language)' …
-# Remember ranges are **exclusive** of the end index.
+# Remember ranges are *exclusive* of the end index.
 jq 'del(.[0,1,2])' …
 jq 'del(.[0:3])' …
 
@@ -75,7 +85,7 @@ jq '.extensionsGallery + {
       itemUrl: "https://marketplace.visualstudio.com/items"
     }' '/usr/lib/code/product.json'
 
-# Merge objects from 2 files
+# Merge objects from 2 files.
 jq '.[0] * .[1]' '1.json' '2.json'
 
 # Only show ('select'ed) elements which specific attribute's value is in a list.
diff --git a/snippets/jq.fish b/snippets/jq.fish
index 81edcbd..24c8953 100644
--- a/snippets/jq.fish
+++ b/snippets/jq.fish
@@ -1,4 +1,113 @@
 #!/usr/bin/env fish
 
+# Run using containers
+docker run --rm -i -v "$PWD:/workdir:ro" --workdir '/workdir' 'ghcr.io/jqlang/jq' '.' 'package.json'
+
+# Include the name of the file in the filtered output
+jq -r 'input_filename' 'package.json'
+jq '{"start":.start,"end":.end,"file":input_filename}' '/tmp/.ansible/async'/*
+
+# Only list keys
+jq 'keys' 'file.json'
+
+# Sort all the keys.
+jq --sort-keys '.' 'input.json' > 'output.json'
+jq --sort-keys '.' 'file.json' | sponge 'file.json'
+
+# Avoid failure due to possibly missing keys
+# Notice the postfix operator '?'
+jq '.spec.template.spec.containers[]?.env?' 'manifest.kube.json'
+
 # Update values of keys
 jq '.dependencies."@pulumi/aws" |= "6.57.0"' 'package.json' | sponge 'package.json'
+
+# Add elements to lists
+jq '.orchestrators += [{"orchestratorVersion": "1.24.9"}]'
+jq --arg 'REGION' "${AWS_REGION}" \
+	'.spec.template.spec.containers[]?.env? += [{name: "AWS_REGION", value: $REGION}]' \
+	'/tmp/service.kube.json'
+yq -iy '.resources+=["awx.yaml"]' 'kustomization.yaml'
+
+# Delete keys from objects
+jq 'del(.items[].spec.clusterIP)' '/tmp/service.kube.json'
+jq 'del(.country, .number, .language)' …
+# Remember ranges *exclude* the end index
+jq 'del(.[0,1,2])' …
+jq 'del(.[0:3])' …
+
+# Remove all null values
+jq 'del(..|nulls)' …
+jq 'del(recurse(.[]?;true)|select(. == null))' …
+
+# Print objects as 'key [space] "value"' pairs
+jq -r 'to_entries[] | "\(.key) \"\(.value)\""' 'file.json'
+
+# Change the value of single keys
+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 the value of multiple keys 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'
+
+# Merge objects from 2 files
+jq '.[0] * .[1]' '1.json' '2.json'
+
+# Only show ('select'ed) elements which specific attribute's value is in a list
+jq '.[]|select(.PrivateIpAddress|IN("172.31.6.209","172.31.6.229"))|.PrivateDnsName' '-'
+
+# Add elements from arrays with the same name from other files.
+jq '.rules=([input.rules]|flatten)' 'starting-rule-set.json' 'ending-rule-set.json'
+jq '.rules=([inputs.rules]|flatten)' 'starting-rule-set.json' 'parts'/*'.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 an AWS 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"))
+	' '-'
+
+# Check that the 'backend.url key' in a 'Pulumi.yaml' file is not 'file://' and fail otherwise
+yq -e '(.backend.url|test("^file://")?)|not' 'Pulumi.yaml'