Fix set -u empty array expansion in 9 scripts

Under set -u, ${ARRAY[@]} on an empty array triggers 'unbound variable'.
Fix: use ${ARRAY[@]+"${ARRAY[@]}"} which expands to nothing when empty.

Scripts fixed: 001, 015, 046, 049, 055, 062, 070, 077, 079
Tested locally: 070, 062, 077, 079 all pass clean.

Author: mwunderl

.gitignore

@@ -0,0 +1,21 @@
+*.log
+*.pem
+aws-eump-logs/
+dynamodb-tutorial-logs/
+Dockerfile
+document.png
+dashboard-body-*.json
+comprehend-policy.json
+hello-world.json
+input.json
+query-results.csv
+sentiment-*.json
+step-functions-trust-policy.json
+stepfunctions-policy.json
+textract-*.json
+updated-hello-world.json
+webserver-template-*.yaml
+qbusiness-*.json
+datazone_script_v3_fixed.log
+idc_setup_*.log
+workspaces_creation.log

tuts/001-lightsail-gs/lightsail-gs.sh

@@ -48,7 +48,7 @@ track_resource() {
 # Function to clean up resources
 cleanup_resources() {
   echo "Resources created by this script:"
-  for resource in "${CREATED_RESOURCES[@]}"; do
+  for resource in "${CREATED_RESOURCES[@]+"${CREATED_RESOURCES[@]}"}"; do
     echo "  $resource"
   done
 
@@ -250,7 +250,7 @@ fi
 # Step 7: Clean up resources
 echo "Step 7: Clean up resources"
 echo "The script has created the following resources:"
-for resource in "${CREATED_RESOURCES[@]}"; do
+for resource in "${CREATED_RESOURCES[@]+"${CREATED_RESOURCES[@]}"}"; do
   echo "  $resource"
 done
 

tuts/015-vpc-peering/vpc-peering.sh

@@ -382,7 +382,7 @@ echo "Route Table 2 ID: $RTB2_ID"
 echo "Route Table 2 Association ID: $RTB2_ASSOC_ID"
 echo ""
 echo "Created resources:"
-for resource in "${CREATED_RESOURCES[@]}"; do
+for resource in "${CREATED_RESOURCES[@]+"${CREATED_RESOURCES[@]}"}"; do
     echo "- $resource"
 done
 echo "=============================================="

tuts/046-aws-systems-manager-gs/aws-systems-manager-gs.sh

@@ -528,7 +528,7 @@ echo ""
 echo "==========================================="
 echo "CREATED RESOURCES"
 echo "==========================================="
-for resource in "${CREATED_RESOURCES[@]}"; do
+for resource in "${CREATED_RESOURCES[@]+"${CREATED_RESOURCES[@]}"}"; do
     echo "$resource"
 done
 

tuts/049-aws-end-user-messaging-gs/aws-end-user-messaging-gs.sh

@@ -43,7 +43,7 @@ cleanup() {
 
     # Optionally delete AWS resources
     if [ "${DELETE_AWS_RESOURCES:-false}" = "true" ]; then
-        for resource in "${AWS_RESOURCES[@]}"; do
+        for resource in "${AWS_RESOURCES[@]+"${AWS_RESOURCES[@]}"}"; do
             echo "Deleting AWS resource: $resource"
             aws pinpoint delete-app --application-id "$resource" 2>/dev/null || \
                 echo "Warning: Failed to delete application $resource"
@@ -406,7 +406,7 @@ echo "==========================================="
 echo "RESOURCES CREATED"
 echo "==========================================="
 echo "AWS Resources:"
-for resource in "${AWS_RESOURCES[@]}"; do
+for resource in "${AWS_RESOURCES[@]+"${AWS_RESOURCES[@]}"}"; do
     echo "- Application: $resource"
 done
 

tuts/055-amazon-vpc-lattice-gs/amazon-vpc-lattice-getting-started.sh

@@ -290,7 +290,7 @@ log_command "aws vpc-lattice list-service-network-vpc-associations --service-net
 # Step 10: Cleanup - Auto-confirm
 echo -e "\n=== Step 10: Resource Cleanup ===" | tee -a "$LOG_FILE"
 echo "Resources created in this tutorial:" | tee -a "$LOG_FILE"
-for resource in "${CREATED_RESOURCES[@]}"; do
+for resource in "${CREATED_RESOURCES[@]+"${CREATED_RESOURCES[@]}"}"; do
     echo "- $resource" | tee -a "$LOG_FILE"
 done
 

tuts/062-aws-support-gs/aws-support-gs.sh

@@ -277,7 +277,7 @@ else
         if [[ ${#CREATED_RESOURCES[@]} -eq 0 ]]; then
             echo "No resources were created."
         else
-            for resource in "${CREATED_RESOURCES[@]}"; do
+            for resource in "${CREATED_RESOURCES[@]+"${CREATED_RESOURCES[@]}"}"; do
                 echo "- $resource"
             done
         fi

tuts/070-amazon-dynamodb-gs/amazon-dynamodb-gs.sh

@@ -89,15 +89,15 @@ cleanup() {
     echo "CLEANUP"
     echo "==========================================="
     echo "Resources to clean up:"
-    for resource in "${RESOURCES[@]}"; do
+    for resource in "${RESOURCES[@]+"${RESOURCES[@]}"}"; do
         echo "- $resource"
     done
     echo ""
 
     if [[ ${#RESOURCES[@]} -gt 0 ]]; then
         echo "Proceeding with cleanup of all created resources..."
 
-        for resource in "${RESOURCES[@]}"; do
+        for resource in "${RESOURCES[@]+"${RESOURCES[@]}"}"; do
             if [[ "$resource" == Table:* ]]; then
                 local table_name="${resource#Table:}"
                 echo "Deleting table: $table_name"

tuts/077-aws-account-management-gs/aws-account-management-gs.sh

@@ -267,7 +267,7 @@ sleep "$API_CALL_DELAY"
 # Security: Define valid contact types
 declare -a CONTACT_TYPES=("BILLING" "OPERATIONS" "SECURITY")
 
-for contact_type in "${CONTACT_TYPES[@]}"; do
+for contact_type in "${CONTACT_TYPES[@]+"${CONTACT_TYPES[@]}"}"; do
     {
         echo ""
         echo "Attempting to check $contact_type contact information..."

tuts/079-aws-iot-device-defender-gs/aws-iot-device-defender-gs.sh

@@ -667,7 +667,7 @@ echo "==================================================="
 echo "AWS IoT Device Defender setup completed successfully!"
 echo "==================================================="
 echo "The following resources were created:"
-for resource in "${CREATED_RESOURCES[@]}"; do
+for resource in "${CREATED_RESOURCES[@]+"${CREATED_RESOURCES[@]}"}"; do
     echo "- $resource"
 done
 echo ""