You are working on a project that requires deploying a CloudFormation stack using AWS CLI commands. You have a code snippet that deploys the stack with the option to specify a region as a command-line argument. Your task is to write a bash script that takes the region as an argument and executes the deployment command accordingly, following the logic in the code snippet.

Write a bash script that does the following:
- If no command-line argument is provided, the script should echo "using default region" and set the `region_string` variable to an empty string.
- If a command-line argument is provided, the script should echo "using set region <arg>" (where `<arg>` is the provided argument) and set the `region_string` variable to "--region <arg>".
- Finally, the script should execute the deployment command, using the `$aws_sl` command and passing the `simple-s3.cfn.yaml` template file and `su-lab-1-1-4` stack name as arguments, along with the `region_string` variable.

Write the bash script, including the necessary conditional statements and command executions, to achieve the desired functionality.
user
Certainly, here's a simple bash script that does what you're asking for:

```bash
#!/bin/bash

# default region, if no argument is provided
region_string=""

# If an argument is provided, set the region.
if [[ $# -gt 0 ]]; then
    region_string="--region $1"
    echo "Using set region $1"
fi

echo "Using default region or region: $region_string"

# Set AWS credentials
aws_sl="/usr/local/bin/aws --profile su-robert-viewer-assistant"

# Deploy stack
echo "Deploying stack using $aws_sl..."
$aws_sl cloudformation deploy --stack-name su-lab-1-1-4 --template-body file://simple-s3.cfn.yaml $region_string

echo "Stack deployment complete."
```

You'll need to replace `/usr/local/bin/aws` with the path to your AWS CLI executable, and `--profile su-robert-viewer-assistant` with your specific AWS profile (if applicable). Make sure the AWS credentials for that profile have permissions to deploy CloudFormation stacks.
assistant
You are working on a project that requires deploying a CloudFormation stack using AWS CLI commands. You have a code snippet that deploys the stack with the option to specify a region as a command-line argument. Your task is to write a bash script that takes the region as an argument and executes the deployment command accordingly, following the logic in the code snippet.

Write a bash script that does the following:
- If no command-line argument is provided, the script should echo "using default region" and set the `region_string` variable to an empty string.
- If a command-line argument is provided, the script should echo "using set region <arg>" (where `<arg>` is the provided argument) and set the `region_string` variable to "--region <arg>".
- Finally, the script should execute the deployment command, using the `$aws_sl` command and passing the `simple-s3.cfn.yaml` template file and `su-lab-1-1-4` stack name as arguments, along with the `region_string` variable.

Write the bash script, including the necessary conditional statements and command executions, to achieve the desired functionality.
user
Here's a bash script that follows the given instructions:

```bash
#!/bin/bash

# Check if an argument is provided
if [ -z "$1" ]; then
    echo "using default region"
    region_string=""
else
    echo "using set region $1"
    region_string="--region $1"
fi

# Execute the deployment command using the provided region
aws_sl="aws cloudformation"
$aws_sl create-stack $region_string \
    --stack-name su-lab-1-1-4 \
    --template-body file://simple-s3.cfn.yaml
```

Save this script to a file, make it executable (`chmod +x filename.sh`), and run it with or without a region argument (`./filename.sh [region]`). The script sets the `region_string` variable and executes the deployment command accordingly.
assistant