Sandbox / Sandpit / Site for AWS Command Line Interface TESTING/LEARNING

Yes, there are a few options available for testing and practicing AWS Command Line Interface (CLI) commands in a sandbox-like environment:

1. AWS CloudShell: This is a browser-based shell service provided by AWS that allows you to run AWS CLI commands directly from your web browser. It comes pre-installed with the AWS CLI, common command-line tools, and popular AWS CLIs like the Amazon ECS CLI and AWS SAM CLI. CloudShell automatically inherits your AWS Management Console credentials, so you don't need to manage local credentials.

2. AWS Cloud9: Although no longer available to new customers, existing users of AWS Cloud9 can use this cloud-based integrated development environment (IDE) to practice AWS CLI commands. It provides a development environment that includes the AWS CLI and aws-shell.

3. LocalStack: This is a local AWS cloud stack that you can run on your own machine using Docker. It emulates various AWS services and allows you to test your AWS CLI commands without incurring any costs. LocalStack is particularly useful for testing infrastructure configurations and can be integrated with tools like Terraform for more comprehensive testing.

4. AWS CLI with a sandbox account: You can set up a separate AWS account specifically for testing and learning purposes. This allows you to practice AWS CLI commands in a real AWS environment without risking your production resources.

These options provide secure and isolated environments where you can practice and test AWS CLI commands, similar to how SQL Fiddle allows you to practice SQL commands. They offer the advantage of working with AWS services and APIs without affecting production environments or incurring unnecessary costs.
Sources
Browser-Based Shell – AWS CloudShell Features – AWS
AWS CLI and aws-shell tutorial for AWS Cloud9 - AWS Cloud9
Test AWS infrastructure by using LocalStack and Terraform Tests - AWS Prescriptive Guidance