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/115-aws-backup-gs/README.md

@@ -39,15 +39,3 @@ No cost until a backup actually runs. This tutorial creates a plan and vault but
 - [Creating a backup plan](https://docs.aws.amazon.com/aws-backup/latest/devguide/creating-a-backup-plan.html)
 - [AWS Backup pricing](https://aws.amazon.com/backup/pricing/)
 - [Supported resources](https://docs.aws.amazon.com/aws-backup/latest/devguide/whatisbackup.html#supported-resources)
-
----
-
-## Appendix: Generation details
-
-| Field | Value |
-|-------|-------|
-| Generation date | 2026-04-14 |
-| Source script | New, 83 lines |
-| Script test result | EXIT 0, 6s, 5 steps, suppressed delete-backup-plan JSON output |
-| Issues encountered | None |
-| Iterations | v1 |

tuts/115-aws-backup-gs/REVISION-HISTORY.md

@@ -0,0 +1,8 @@
+# Revision History: 115-aws-backup-gs
+
+## Shell (CLI script)
+
+### 2026-04-14 v1 published
+- Type: functional
+- Initial version
+

tuts/115-aws-backup-gs/aws-backup-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)
 VAULT_NAME="tut-vault-${RANDOM_ID}"
 PLAN_NAME="tut-plan-${RANDOM_ID}"
 

tuts/121-aws-organizations-gs/REVISION-HISTORY.md

@@ -0,0 +1,8 @@
+# Revision History: 121-aws-organizations-gs
+
+## Shell (CLI script)
+
+### 2026-04-14 v1 published
+- Type: functional
+- Initial version
+

tuts/121-aws-organizations-gs/aws-organizations-gs.sh

@@ -1,7 +1,7 @@
 #!/bin/bash
 WORK_DIR=$(mktemp -d)
 exec > >(tee -a "$WORK_DIR/orgs-$(date +%Y%m%d-%H%M%S).log") 2>&1
-REGION=${AWS_DEFAULT_REGION:-$(aws configure get region 2>/dev/null)}
+REGION=${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"

tuts/122-aws-health-gs/REVISION-HISTORY.md

@@ -0,0 +1,8 @@
+# Revision History: 122-aws-health-gs
+
+## Shell (CLI script)
+
+### 2026-04-14 v1 published
+- Type: functional
+- Initial version
+

tuts/122-aws-health-gs/aws-health-gs.sh

@@ -1,7 +1,7 @@
 #!/bin/bash
 WORK_DIR=$(mktemp -d)
 exec > >(tee -a "$WORK_DIR/health-$(date +%Y%m%d-%H%M%S).log") 2>&1
-REGION=${AWS_DEFAULT_REGION:-$(aws configure get region 2>/dev/null)}
+REGION=${AWS_DEFAULT_REGION:-${AWS_REGION:-$(aws configure get region 2>/dev/null))}
 [ -z "$REGION" ] && echo "ERROR: No region" && exit 1
 export AWS_DEFAULT_REGION=us-east-1
 echo "Region: us-east-1 (Health API is global)"

tuts/124-aws-ssm-gs/REVISION-HISTORY.md

@@ -0,0 +1,8 @@
+# Revision History: 124-aws-ssm-gs
+
+## Shell (CLI script)
+
+### 2026-04-14 v1 published
+- Type: functional
+- Initial version
+

tuts/124-aws-ssm-gs/aws-ssm-gs.sh

@@ -1,11 +1,11 @@
 #!/bin/bash
 WORK_DIR=$(mktemp -d)
 exec > >(tee -a "$WORK_DIR/ssm-$(date +%Y%m%d-%H%M%S).log") 2>&1
-REGION=${AWS_DEFAULT_REGION:-$(aws configure get region 2>/dev/null)}
+REGION=${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: $REGION"
-RANDOM_ID=$(openssl rand -hex 4)
+RANDOM_ID=$(cat /dev/urandom | tr -dc 'a-z0-9' | fold -w 8 | head -n 1)
 handle_error() { echo "ERROR on line $1"; trap - ERR; cleanup; exit 1; }
 trap 'handle_error $LINENO' ERR
 cleanup() { echo ""; echo "Cleaning up..."; aws ssm delete-parameter --name "/tutorial/$RANDOM_ID/db-host" 2>/dev/null; aws ssm delete-parameter --name "/tutorial/$RANDOM_ID/db-password" 2>/dev/null; aws ssm delete-parameter --name "/tutorial/$RANDOM_ID/app-config" 2>/dev/null; echo "  Deleted parameters"; rm -rf "$WORK_DIR"; echo "Done."; }

tuts/140-aws-trustedadvisor-gs/REVISION-HISTORY.md

@@ -0,0 +1,8 @@
+# Revision History: 140-aws-trustedadvisor-gs
+
+## Shell (CLI script)
+
+### 2026-04-14 v1 published
+- Type: functional
+- Initial version
+