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/107-amazon-efs-gs/README.md

@@ -41,15 +41,3 @@ Per-GB pricing. $0.30/GB-month (Standard), $0.025/GB-month (Infrequent Access).
 - [Creating file systems](https://docs.aws.amazon.com/efs/latest/ug/creating-using-create-fs.html)
 - [Creating mount targets](https://docs.aws.amazon.com/efs/latest/ug/accessing-fs.html)
 - [EFS lifecycle management](https://docs.aws.amazon.com/efs/latest/ug/lifecycle-management-efs.html)
-
----
-
-## Appendix: Generation details
-
-| Field | Value |
-|-------|-------|
-| Generation date | 2026-04-14 |
-| Source script | New, 117 lines |
-| Script test result | EXIT 0, 114s, 7 steps, no issues |
-| Issues encountered | Mount target deletion wait increased to 120s |
-| Iterations | v1 (direct to publish) |

tuts/107-amazon-efs-gs/REVISION-HISTORY.md

@@ -0,0 +1,8 @@
+# Revision History: 107-amazon-efs-gs
+
+## Shell (CLI script)
+
+### 2026-04-14 v1 published
+- Type: functional
+- Initial version
+

tuts/107-amazon-efs-gs/amazon-efs-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)
 FS_TOKEN="tut-efs-${RANDOM_ID}"
 
 handle_error() { echo "ERROR on line $1"; trap - ERR; cleanup; exit 1; }

tuts/127-amazon-glacier-gs/REVISION-HISTORY.md

@@ -0,0 +1,8 @@
+# Revision History: 127-amazon-glacier-gs
+
+## Shell (CLI script)
+
+### 2026-04-14 v1 published
+- Type: functional
+- Initial version
+

tuts/127-amazon-glacier-gs/amazon-glacier-gs.sh

@@ -1,11 +1,11 @@
 #!/bin/bash
 WORK_DIR=$(mktemp -d)
 exec > >(tee -a "$WORK_DIR/glacier-$(date +%Y%m%d-%H%M%S).log") 2>&1
-REGION=${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=$(cat /dev/urandom | tr -dc 'a-z0-9' | fold -w 8 | head -n 1)
 VAULT_NAME="tut-vault-${RANDOM_ID}"
 handle_error() { echo "ERROR on line $1"; trap - ERR; cleanup; exit 1; }
 trap 'handle_error $LINENO' ERR

tuts/156-s3-event-notifications/REVISION-HISTORY.md

@@ -0,0 +1,8 @@
+# Revision History: 156-s3-event-notifications
+
+## Shell (CLI script)
+
+### 2026-04-14 v1 published
+- Type: functional
+- Initial version
+

tuts/156-s3-event-notifications/s3-events.sh

@@ -1,7 +1,7 @@
 #!/bin/bash
 WORK_DIR=$(mktemp -d); exec > >(tee -a "$WORK_DIR/s3-events.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"; ACCOUNT=$(aws sts get-caller-identity --query 'Account' --output text); echo "Region: $REGION"
-RANDOM_ID=$(openssl rand -hex 4); BUCKET="s3-events-tut-${RANDOM_ID}-${ACCOUNT}"; QUEUE="s3-events-tut-${RANDOM_ID}"
+REGION=${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"; ACCOUNT=$(aws sts get-caller-identity --query 'Account' --output text); echo "Region: $REGION"
+RANDOM_ID=$(cat /dev/urandom | tr -dc 'a-z0-9' | fold -w 8 | head -n 1); BUCKET="s3-events-tut-${RANDOM_ID}-${ACCOUNT}"; QUEUE="s3-events-tut-${RANDOM_ID}"
 handle_error() { echo "ERROR on line $1"; trap - ERR; cleanup; exit 1; }; trap 'handle_error $LINENO' ERR
 cleanup() { echo ""; echo "Cleaning up..."; aws s3 rm "s3://$BUCKET" --recursive --quiet 2>/dev/null; aws s3 rb "s3://$BUCKET" 2>/dev/null && echo "  Deleted bucket"; [ -n "$QUEUE_URL" ] && aws sqs delete-queue --queue-url "$QUEUE_URL" 2>/dev/null && echo "  Deleted queue"; rm -rf "$WORK_DIR"; echo "Done."; }
 echo "Step 1: Creating SQS queue for notifications"

tuts/167-s3-presigned-urls/REVISION-HISTORY.md

@@ -0,0 +1,8 @@
+# Revision History: 167-s3-presigned-urls
+
+## Shell (CLI script)
+
+### 2026-04-14 v1 published
+- Type: functional
+- Initial version
+

tuts/167-s3-presigned-urls/s3-presigned.sh

@@ -1,7 +1,7 @@
 #!/bin/bash
 WORK_DIR=$(mktemp -d); exec > >(tee -a "$WORK_DIR/presign.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"; ACCOUNT=$(aws sts get-caller-identity --query 'Account' --output text); echo "Region: $REGION"
-RANDOM_ID=$(openssl rand -hex 4); BUCKET="presign-tut-${RANDOM_ID}-${ACCOUNT}"
+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="$REGION"; ACCOUNT=$(aws sts get-caller-identity --query 'Account' --output text); echo "Region: $REGION"
+RANDOM_ID=$(cat /dev/urandom | tr -dc 'a-z0-9' | fold -w 8 | head -n 1); BUCKET="presign-tut-${RANDOM_ID}-${ACCOUNT}"
 handle_error() { echo "ERROR on line $1"; trap - ERR; cleanup; exit 1; }; trap 'handle_error $LINENO' ERR
 cleanup() { echo ""; echo "Cleaning up..."; aws s3 rm "s3://$BUCKET" --recursive --quiet 2>/dev/null; aws s3 rb "s3://$BUCKET" 2>/dev/null && echo "  Deleted bucket"; rm -rf "$WORK_DIR"; echo "Done."; }
 echo "Step 1: Creating bucket"

tuts/171-s3-versioning/REVISION-HISTORY.md

@@ -0,0 +1,8 @@
+# Revision History: 171-s3-versioning
+
+## Shell (CLI script)
+
+### 2026-04-14 v1 published
+- Type: functional
+- Initial version
+