CLI scripting basics in AWS - Commands & Configuration

Introduction

Using the AWS CLI lets you control cloud services from your computer by typing commands. Scripting these commands helps automate tasks, saving time and avoiding mistakes.

When you want to create or delete cloud resources without clicking in the web console.

When you need to repeat the same setup steps for multiple projects quickly.

When you want to schedule tasks like backups or updates to run automatically.

When you want to check the status of your cloud resources from your terminal.

When you want to combine multiple AWS commands into one script for efficiency.

Commands

This command sets your default AWS region to us-east-1 so that all commands run in this location unless specified otherwise.

Terminal

aws configure set region us-east-1

Expected Output

No output (command runs silently)

This command creates a new S3 bucket named example-bucket-cli-scripting to store files in the cloud.

Terminal

aws s3 mb s3://example-bucket-cli-scripting

Expected Output

make_bucket: example-bucket-cli-scripting

This command lists all your S3 buckets so you can verify the new bucket was created.

Terminal

aws s3 ls

Expected Output

2024-06-01 12:00:00 example-bucket-cli-scripting

This command deletes the S3 bucket example-bucket-cli-scripting and all its contents. The --force flag is needed to remove non-empty buckets.

Terminal

aws s3 rb s3://example-bucket-cli-scripting --force

Expected Output

remove_bucket: example-bucket-cli-scripting

→

--force - Deletes all objects in the bucket before removing the bucket itself.

Key Concept

If you remember nothing else, remember: AWS CLI commands can be combined in scripts to automate cloud tasks safely and quickly.

Common Mistakes

Not setting the AWS region before running commands.

Commands may fail or run in the wrong region, causing confusion or errors.

Always run 'aws configure set region your-region' before other commands.

Trying to delete a non-empty S3 bucket without the --force flag.

AWS will refuse to delete buckets that still have files inside.

Use the --force flag to delete all contents before removing the bucket.

Typing commands with incorrect bucket names or typos.

Commands will fail because the resource does not exist or is misspelled.

Double-check names and use copy-paste to avoid typos.

Summary

Set your AWS region first to ensure commands run in the right place.

Create and list S3 buckets using simple AWS CLI commands.

Use the --force flag to delete buckets that contain files.