# AWS CLI — Universal Command Line Interface for Amazon Web Services

> The AWS CLI provides unified access to all AWS services from the terminal, enabling scripted infrastructure management, automation, and direct API interaction.

## Install

Save in your project root:

# AWS CLI — Universal Command Line Interface for Amazon Web Services

## Quick Use
```bash
# Install on Linux
curl "https://awscli.amazonaws.com/awscli-exe-linux-x86_64.zip" -o awscliv2.zip
unzip awscliv2.zip && sudo ./aws/install
# Configure credentials
aws configure
# List S3 buckets
aws s3 ls
```

## Introduction
The AWS CLI is the official command-line tool for interacting with Amazon Web Services. It wraps the AWS SDK for Python (botocore) and exposes every AWS API operation as a subcommand, making it the backbone of cloud automation scripts, CI/CD pipelines, and day-to-day AWS administration.

## What AWS CLI Does
- Provides commands for every AWS service API (EC2, S3, Lambda, IAM, etc.)
- Supports JSON, YAML, table, and text output formats for scripting
- Enables server-side and client-side filtering with `--query` (JMESPath)
- Handles pagination, retries, and credential management automatically
- Offers high-level S3 commands (`cp`, `sync`, `mv`) for bulk file operations

## Architecture Overview
AWS CLI v2 is distributed as a self-contained installer with a bundled Python runtime, eliminating dependency conflicts. It reads credentials from `~/.aws/credentials`, environment variables, or IAM roles. Each command maps to a REST API call against AWS endpoints, with automatic request signing using Signature Version 4.

## Self-Hosting & Configuration
- Install via official installer (Linux, macOS, Windows) or Docker image `amazon/aws-cli`
- Store profiles in `~/.aws/config` for multi-account and multi-region setups
- Use `aws configure sso` for AWS IAM Identity Center (SSO) authentication
- Enable CLI auto-prompt with `aws --cli-auto-prompt` for interactive discovery
- Set `AWS_PAGER` to control output paging behavior

## Key Features
- AWS CloudShell integration for browser-based CLI access with pre-authenticated sessions
- Wizards for complex operations like `aws configure` and `aws dynamodb wizard`
- Server-side `--filters` reduce API response payloads before transfer
- Supports assume-role chaining and MFA token prompts for secure cross-account access
- YAML output format (v2 exclusive) for human-readable structured data

## Comparison with Similar Tools
- **Azure CLI** — equivalent tool for Microsoft Azure cloud services
- **gcloud CLI** — Google Cloud's command-line interface
- **eksctl** — specialized CLI for Amazon EKS cluster management
- **Terraform** — declarative IaC that provisions AWS resources via state files
- **Pulumi** — IaC using general-purpose programming languages, supports AWS

## FAQ
**Q: What is the difference between AWS CLI v1 and v2?**
A: v2 bundles its own Python, adds SSO support, auto-prompt, YAML output, and improved installers. v1 requires a separate Python installation.

**Q: How do I manage multiple AWS accounts?**
A: Use named profiles in `~/.aws/config` and switch with `--profile <name>` or the `AWS_PROFILE` environment variable.

**Q: Can the AWS CLI run in CI/CD pipelines?**
A: Yes. Set `AWS_ACCESS_KEY_ID` and `AWS_SECRET_ACCESS_KEY` environment variables, or use OIDC-based role assumption in GitHub Actions and similar platforms.

**Q: Is the AWS CLI open source?**
A: Yes, the source is on GitHub under an Apache-compatible license, though it depends on the proprietary AWS service APIs.

## Sources
- https://github.com/aws/aws-cli
- https://docs.aws.amazon.com/cli/

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Author: AI Open Source