diff --git a/knowledge base/cloud computing/aws/cli.md b/knowledge base/cloud computing/aws/cli.md
index 192f9b1..cebe75a 100644
--- a/knowledge base/cloud computing/aws/cli.md	
+++ b/knowledge base/cloud computing/aws/cli.md	
@@ -24,11 +24,28 @@ aws configure --profile 'work'
 export AWS_PROFILE='work'
 
 
-# Enable auto-prompt mode (like aws-shell).
+# Enable auto-prompt mode (like `aws-shell` does).
 aws configure set 'cli_auto_prompt' 'on-partial'
 export AWS_CLI_AUTO_PROMPT='on'
 
 
+# List applications in CodeDeploy.
+aws deploy list-applications
+
+# List deployment groups defined for applications.
+aws deploy list-deployment-groups --application-name 'batman'
+
+# Show details of deployment groups.
+aws deploy get-deployment-group --application-name 'batman' \
+  --deployment-group-name 'production'
+
+
+
+# Show RDS instances.
+aws rds describe-db-instances
+aws rds describe-db-instances --output 'json' --query "DBInstances[?(DBInstanceIdentifier=='master-prod')]"
+
+
 # List all SageMaker EndpointConfigurations' names.
 aws sagemaker list-endpoint-configs --output 'yaml-stream' | yq -r '.[].EndpointConfigs[].EndpointConfigName' -
 aws sagemaker list-endpoint-configs --output 'yaml-stream' --query 'EndpointConfigs[].EndpointConfigName' | yq -r '.[].[]' -
@@ -49,6 +66,10 @@ aws secretsmanager describe-secret --secret-id 'ecr-pullthroughcache/docker-hub'
 aws secretsmanager get-secret-value --secret-id 'ecr-pullthroughcache/github'
 
 
+# List SNS queues (a.k.a. 'topics').
+aws sns list-topics
+
+
 # Start sessions via Session Manager.
 aws ssm start-session --target 'i-0123456789abcdef0'
 ```
diff --git a/knowledge base/cloud computing/aws/s3.md b/knowledge base/cloud computing/aws/s3.md
index 0a73a03..6307fe7 100644
--- a/knowledge base/cloud computing/aws/s3.md	
+++ b/knowledge base/cloud computing/aws/s3.md	
@@ -63,21 +63,6 @@ aws s3 sync '.' 's3://arn:aws:s3:us-west-2:123456789012:accesspoint/myaccesspoin
 # Delete buckets.
 aws s3 rb 's3://my-bucket'
 aws s3 rb 's3://my-bucket' --force
-
-
-# Lifecycle configurations.
-aws s3api get-bucket-lifecycle-configuration --bucket 'bucketName'
-aws s3api put-bucket-lifecycle-configuration --bucket 'bucketName' \
-  --lifecycle-configuration 'file://lifecycle.definition.json'
-aws s3api delete-bucket-lifecycle-configuration --bucket 'bucketName'
-
-
-# Show tags on objects.
-aws s3api list-objects-v2 \
-  --bucket 'my-bucket' --prefix 'someObjectsInHereAreTagged' \
-  --query 'Contents[*].Key' --output text \
-| xargs -n 1 \
-    aws s3api get-object-tagging --bucket 'my-bucket' --query 'TagSet[*]' --key
 ```
 
 </details>
@@ -87,10 +72,29 @@ aws s3api list-objects-v2 \
 
 ```sh
 # Manage lifecycle configurations.
-aws s3 get-bucket-lifecycle-configuration --bucket 'batman'
-aws s3 put-bucket-lifecycle-configuration --bucket 'batman'  \
-  --lifecycle-configuration 'file://lifecycle-batman.json'
-aws s3 delete-bucket-lifecycle --bucket 'batman'
+# Operations on lifecycle rules take a while.
+aws s3api get-bucket-lifecycle-configuration --bucket 'bucketName'
+aws s3api put-bucket-lifecycle-configuration --bucket 'bucketName' \
+  --lifecycle-configuration 'file://lifecycle.definition.json'
+aws s3api delete-bucket-lifecycle-configuration --bucket 'bucketName'
+```
+
+</details>
+
+<details>
+  <summary>Real life use cases</summary>
+
+```sh
+# Get objects with their storage class.
+aws s3api list-objects --bucket 'my-bucket' \
+  --query 'Contents[].{Key: Key, StorageClass: StorageClass}'
+
+# Show tags on objects.
+aws s3api list-objects-v2 \
+  --bucket 'my-bucket' --prefix 'someObjectsInHereAreTagged' \
+  --query 'Contents[*].Key' --output text \
+| xargs -n 1 \
+    aws s3api get-object-tagging --bucket 'my-bucket' --query 'TagSet[*]' --key
 ```
 
 </details>