Apply technical requirements (R1, R2, R9, R10, R13)

- R1: Add AWS_REGION to region fallback chain
- R2: Replace openssl rand with /dev/urandom
- R9: Remove Appendix/Generation details from READMEs
- R10: Remove internal references
- R13: Add REVISION-HISTORY.md

Author: mwunderl

tuts/084-lambda-sqs/README.md

@@ -58,15 +58,3 @@ Free tier eligible. No charges expected for a few messages.
 - [Using Lambda with Amazon SQS](https://docs.aws.amazon.com/lambda/latest/dg/with-sqs.html)
 - [Tutorial: Using Lambda with Amazon SQS](https://docs.aws.amazon.com/lambda/latest/dg/with-sqs-example.html)
 - [Amazon SQS visibility timeout](https://docs.aws.amazon.com/AWSSimpleQueueService/latest/SQSDeveloperGuide/sqs-visibility-timeout.html)
-
----
-
-## Appendix: Generation details
-
-| Field | Value |
-|-------|-------|
-| Generation date | 2026-04-14 |
-| Source script | Rewritten from internal 084-lambda-sqs-2-cli-script-v2.sh |
-| Script test result | EXIT 0, 44s, 7 steps, clean teardown |
-| Issues encountered | Original used `set -e` with `log_command` wrapper (replaced with ERR trap); missing `fileb://` for payload (fixed); original used nodejs22.x (kept) |
-| Iterations | v1 (internal), v2 (wait-for-active + region fix), v3 (clean rewrite for publish) |

tuts/084-lambda-sqs/REVISION-HISTORY.md

@@ -0,0 +1,8 @@
+# Revision History: 084-lambda-sqs
+
+## Shell (CLI script)
+
+### 2026-04-14 v1 published
+- Type: functional
+- Initial version
+

tuts/084-lambda-sqs/lambda-sqs.sh

@@ -14,7 +14,7 @@ fi
 export AWS_DEFAULT_REGION="$REGION"
 echo "Region: $REGION"
 
-RANDOM_ID=$(openssl rand -hex 4)
+RANDOM_ID=$(cat /dev/urandom | tr -dc 'a-z0-9' | fold -w 8 | head -n 1)
 ROLE_NAME="lambda-sqs-role-${RANDOM_ID}"
 FUNCTION_NAME="sqs-processor-${RANDOM_ID}"
 QUEUE_NAME="lambda-tut-queue-${RANDOM_ID}"

tuts/089-lambda-sns/README.md

@@ -57,15 +57,3 @@ Free tier eligible. No charges expected for a single message.
 - [Using Lambda with Amazon SNS](https://docs.aws.amazon.com/lambda/latest/dg/with-sns.html)
 - [Tutorial: Using an AWS Lambda function as a subscriber](https://docs.aws.amazon.com/lambda/latest/dg/with-sns-example.html)
 - [Amazon SNS message filtering](https://docs.aws.amazon.com/sns/latest/dg/sns-message-filtering.html)
-
----
-
-## Appendix: Generation details
-
-| Field | Value |
-|-------|-------|
-| Generation date | 2026-04-14 |
-| Source script | Rewritten from internal 089-lambda-sns-2-cli-script-v3.sh |
-| Script test result | EXIT 0, 33s, 6 steps, clean teardown |
-| Issues encountered | ERR trap recursion in log retrieval loop (fixed with `|| true`); `add-permission` JSON output noise (suppressed); original used nodejs18.x (upgraded to 22) |
-| Iterations | v1 (internal, nodejs18), v2 (wait-for-active patch), v3 (clean rewrite for publish) |

tuts/089-lambda-sns/REVISION-HISTORY.md

@@ -0,0 +1,8 @@
+# Revision History: 089-lambda-sns
+
+## Shell (CLI script)
+
+### 2026-04-14 v1 published
+- Type: functional
+- Initial version
+

tuts/089-lambda-sns/lambda-sns.sh

@@ -14,7 +14,7 @@ fi
 export AWS_DEFAULT_REGION="$REGION"
 echo "Region: $REGION"
 
-RANDOM_ID=$(openssl rand -hex 4)
+RANDOM_ID=$(cat /dev/urandom | tr -dc 'a-z0-9' | fold -w 8 | head -n 1)
 TOPIC_NAME="sns-lambda-tut-${RANDOM_ID}"
 ROLE_NAME="lambda-sns-role-${RANDOM_ID}"
 FUNCTION_NAME="sns-processor-${RANDOM_ID}"

tuts/097-amazon-ec2-autoscaling-gs/REVISION-HISTORY.md

@@ -0,0 +1,8 @@
+# Revision History: 097-amazon-ec2-autoscaling-gs
+
+## Shell (CLI script)
+
+### 2026-04-14 v1 published
+- Type: functional
+- Initial version
+

tuts/097-amazon-ec2-autoscaling-gs/amazon-ec2-autoscaling-gs.sh

@@ -14,7 +14,7 @@ fi
 export AWS_DEFAULT_REGION="$REGION"
 echo "Region: $REGION"
 
-RANDOM_ID=$(openssl rand -hex 4)
+RANDOM_ID=$(cat /dev/urandom | tr -dc 'a-z0-9' | fold -w 8 | head -n 1)
 LT_NAME="tut-lt-${RANDOM_ID}"
 ASG_NAME="tut-asg-${RANDOM_ID}"
 

tuts/151-lambda-layers/REVISION-HISTORY.md

@@ -0,0 +1,8 @@
+# Revision History: 151-lambda-layers
+
+## Shell (CLI script)
+
+### 2026-04-14 v1 published
+- Type: functional
+- Initial version
+

tuts/151-lambda-layers/lambda-layers.sh

@@ -1,7 +1,7 @@
 #!/bin/bash
 WORK_DIR=$(mktemp -d); exec > >(tee -a "$WORK_DIR/lambda-layers.log") 2>&1
-REGION=${AWS_DEFAULT_REGION:-$(aws configure get region 2>/dev/null)}; [ -z "$REGION" ] && echo "ERROR: No region" && exit 1; export AWS_DEFAULT_REGION="$REGION"; echo "Region: $REGION"
-RANDOM_ID=$(openssl rand -hex 4); LAYER_NAME="tut-layer-${RANDOM_ID}"; FUNC_NAME="tut-layer-func-${RANDOM_ID}"; ROLE_NAME="lambda-layer-role-${RANDOM_ID}"
+REGION=${AWS_DEFAULT_REGION:-${AWS_REGION:-$(aws configure get region 2>/dev/null))}; [ -z "$REGION" ] && echo "ERROR: No region" && exit 1; export AWS_DEFAULT_REGION="$REGION"; echo "Region: $REGION"
+RANDOM_ID=$(cat /dev/urandom | tr -dc 'a-z0-9' | fold -w 8 | head -n 1); LAYER_NAME="tut-layer-${RANDOM_ID}"; FUNC_NAME="tut-layer-func-${RANDOM_ID}"; ROLE_NAME="lambda-layer-role-${RANDOM_ID}"
 handle_error() { echo "ERROR on line $1"; trap - ERR; cleanup; exit 1; }; trap 'handle_error $LINENO' ERR
 cleanup() { echo ""; echo "Cleaning up..."; aws lambda delete-function --function-name "$FUNC_NAME" 2>/dev/null && echo "  Deleted function"; aws lambda delete-layer-version --layer-name "$LAYER_NAME" --version-number 1 2>/dev/null && echo "  Deleted layer"; aws iam detach-role-policy --role-name "$ROLE_NAME" --policy-arn arn:aws:iam::aws:policy/service-role/AWSLambdaBasicExecutionRole 2>/dev/null; aws iam delete-role --role-name "$ROLE_NAME" 2>/dev/null && echo "  Deleted role"; rm -rf "$WORK_DIR"; echo "Done."; }
 echo "Step 1: Creating a layer"