Add README.md and tutorial walkthrough for script-only tutorials

Author: mwunderl

tuts/203-dynamodb-batch-operations/README.md

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+# Dynamodb Batch Ops
+
+An AWS CLI tutorial that demonstrates Dynamodb operations.
+
+## Running
+
+```bash
+bash dynamodb-batch-ops.sh
+```
+
+To auto-run with cleanup:
+
+```bash
+echo 'y' | bash dynamodb-batch-ops.sh
+```
+
+## What it does
+
+1. Creating table"; aws dynamodb create-table --table-name "$T" --key-schema AttributeName=pk,KeyType=HASH --attribute-definitions AttributeName=pk,AttributeType=S --billing-mode PAY_PER_REQUEST > /dev/null; aws dynamodb wait table-exists --table-name "$T
+2. Batch write (25 items)"; aws dynamodb batch-write-item --request-items "{\"$T\":[$(for i in $(seq 1 25); do echo -n "{\"PutRequest\":{\"Item\":{\"pk\":{\"S\":\"item-$i\"},\"data\":{\"S\":\"value-$i\"}}}}"; [ $i -lt 25 ] && echo -n ","; done)]}
+3. Batch get (5 items)"; aws dynamodb batch-get-item --request-items "{\"$T\":{\"Keys\":[{\"pk\":{\"S\":\"item-1\"}},{\"pk\":{\"S\":\"item-5\"}},{\"pk\":{\"S\":\"item-10\"}},{\"pk\":{\"S\":\"item-15\"}},{\"pk\":{\"S\":\"item-20\"}}]}}" --query "Responses.\"$T\"[].{pk:pk.S,data:data.S}
+4. Scan count"; aws dynamodb scan --table-name "$T
+
+## Resources created
+
+- Table
+
+The script prompts you to clean up resources when it finishes.
+
+## Cost
+
+Free tier eligible for most operations. Clean up resources after use to avoid charges.
+
+## Related docs
+
+- [AWS CLI dynamodb reference](https://docs.aws.amazon.com/cli/latest/reference/dynamodb/index.html)
+

tuts/203-dynamodb-batch-operations/dynamodb-batch-ops.md

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+# Dynamodb Batch Ops
+
+## Prerequisites
+
+1. AWS CLI installed and configured (`aws configure`)
+2. Appropriate IAM permissions for the AWS services used
+
+## Step 1: Creating table"; aws dynamodb create-table --table-name "$T" --key-schema AttributeName=pk,KeyType=HASH --attribute-definitions AttributeName=pk,AttributeType=S --billing-mode PAY_PER_REQUEST > /dev/null; aws dynamodb wait table-exists --table-name "$T
+
+The script handles this step automatically. See `dynamodb-batch-ops.sh` for the exact CLI commands.
+
+## Step 2: Batch write (25 items)"; aws dynamodb batch-write-item --request-items "{\"$T\":[$(for i in $(seq 1 25); do echo -n "{\"PutRequest\":{\"Item\":{\"pk\":{\"S\":\"item-$i\"},\"data\":{\"S\":\"value-$i\"}}}}"; [ $i -lt 25 ] && echo -n ","; done)]}
+
+The script handles this step automatically. See `dynamodb-batch-ops.sh` for the exact CLI commands.
+
+## Step 3: Batch get (5 items)"; aws dynamodb batch-get-item --request-items "{\"$T\":{\"Keys\":[{\"pk\":{\"S\":\"item-1\"}},{\"pk\":{\"S\":\"item-5\"}},{\"pk\":{\"S\":\"item-10\"}},{\"pk\":{\"S\":\"item-15\"}},{\"pk\":{\"S\":\"item-20\"}}]}}" --query "Responses.\"$T\"[].{pk:pk.S,data:data.S}
+
+The script handles this step automatically. See `dynamodb-batch-ops.sh` for the exact CLI commands.
+
+## Step 4: Scan count"; aws dynamodb scan --table-name "$T
+
+The script handles this step automatically. See `dynamodb-batch-ops.sh` for the exact CLI commands.
+
+## Cleanup
+
+The script prompts you to clean up all created resources. If you need to clean up manually, check the script log for the resource names that were created.
+

tuts/208-lambda-list-functions/README.md

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+# Lambda List Functions
+
+A read-only script that queries Lambda resources and displays information.
+
+## Running
+
+```bash
+bash lambda-list-functions.sh
+```
+
+## What it does
+
+1. Listing functions
+2. Function count by runtime
+
+## Resources created
+
+None — this script is read-only.
+
+## Cost
+
+No cost. This script only reads existing resources.
+
+## Related docs
+
+- [AWS CLI lambda reference](https://docs.aws.amazon.com/cli/latest/reference/lambda/index.html)
+

tuts/208-lambda-list-functions/lambda-list-functions.md

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+# Lambda List Functions
+
+## Prerequisites
+
+1. AWS CLI installed and configured (`aws configure`)
+2. Appropriate IAM permissions for the AWS services used
+
+## Step 1: Listing functions
+
+The script handles this step automatically. See `lambda-list-functions.sh` for the exact CLI commands.
+
+## Step 2: Function count by runtime
+
+The script handles this step automatically. See `lambda-list-functions.sh` for the exact CLI commands.
+

tuts/213-ec2-security-group-audit/README.md

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+# Ec2 Security Group Rules
+
+A read-only script that queries Ec2 resources and displays information.
+
+## Running
+
+```bash
+bash ec2-security-group-rules.sh
+```
+
+## What it does
+
+1. Listing security groups
+2. Finding groups with open SSH
+
+## Resources created
+
+None — this script is read-only.
+
+## Cost
+
+No cost. This script only reads existing resources.
+
+## Related docs
+
+- [AWS CLI ec2 reference](https://docs.aws.amazon.com/cli/latest/reference/ec2/index.html)
+

tuts/213-ec2-security-group-audit/ec2-security-group-rules.md

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+# Ec2 Security Group Rules
+
+## Prerequisites
+
+1. AWS CLI installed and configured (`aws configure`)
+2. Appropriate IAM permissions for the AWS services used
+
+## Step 1: Listing security groups
+
+The script handles this step automatically. See `ec2-security-group-rules.sh` for the exact CLI commands.
+
+## Step 2: Finding groups with open SSH
+
+The script handles this step automatically. See `ec2-security-group-rules.sh` for the exact CLI commands.
+

tuts/215-lambda-event-invoke-config/README.md

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+# Lambda Event Invoke Config
+
+A read-only script that queries Lambda resources and displays information.
+
+## Running
+
+```bash
+bash lambda-event-invoke-config.sh
+```
+
+## What it does
+
+1. Listing functions with event invoke configs
+
+## Resources created
+
+None — this script is read-only.
+
+## Cost
+
+No cost. This script only reads existing resources.
+
+## Related docs
+
+- [AWS CLI lambda reference](https://docs.aws.amazon.com/cli/latest/reference/lambda/index.html)
+

tuts/215-lambda-event-invoke-config/lambda-event-invoke-config.md

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+# Lambda Event Invoke Config
+
+## Prerequisites
+
+1. AWS CLI installed and configured (`aws configure`)
+2. Appropriate IAM permissions for the AWS services used
+
+## Step 1: Listing functions with event invoke configs
+
+The script handles this step automatically. See `lambda-event-invoke-config.sh` for the exact CLI commands.
+

tuts/216-ec2-cost-optimization/README.md

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+# Ec2 Cost Optimization
+
+A read-only script that queries Ec2 resources and displays information.
+
+## Running
+
+```bash
+bash ec2-cost-optimization.sh
+```
+
+## What it does
+
+1. Finding stopped instances (still incurring EBS charges)
+2. Finding unattached EBS volumes
+3. Finding unattached Elastic IPs
+4. Finding old snapshots (>90 days)
+
+## Resources created
+
+None — this script is read-only.
+
+## Cost
+
+No cost. This script only reads existing resources.
+
+## Related docs
+
+- [AWS CLI ec2 reference](https://docs.aws.amazon.com/cli/latest/reference/ec2/index.html)
+

tuts/216-ec2-cost-optimization/ec2-cost-optimization.md

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+# Ec2 Cost Optimization
+
+## Prerequisites
+
+1. AWS CLI installed and configured (`aws configure`)
+2. Appropriate IAM permissions for the AWS services used
+
+## Step 1: Finding stopped instances (still incurring EBS charges)
+
+The script handles this step automatically. See `ec2-cost-optimization.sh` for the exact CLI commands.
+
+## Step 2: Finding unattached EBS volumes
+
+The script handles this step automatically. See `ec2-cost-optimization.sh` for the exact CLI commands.
+
+## Step 3: Finding unattached Elastic IPs
+
+The script handles this step automatically. See `ec2-cost-optimization.sh` for the exact CLI commands.
+
+## Step 4: Finding old snapshots (>90 days)
+
+The script handles this step automatically. See `ec2-cost-optimization.sh` for the exact CLI commands.
+