The AWS Command Line Interface (AWS CLI) is a unified tool that provides a consistent interface for interacting with all parts of AWS. AWS CLI commands for different services are covered in the accompanying user guide, including descriptions, syntax, and usage examples.

User Guide
Describes all the AWS CLI concepts and provides instructions on using the various features of the CLI.
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  CLI Reference
Describes the AWS CLI in detail and provides basic syntax, options, and usage examples for each operation.