Command line tool for managing Amazon S3 and CloudFront services

S3CMD

S3cmd tool for Amazon Simple Storage Service (S3)
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S3cmd is a free command line tool and client for uploading, 
retrieving and managing data in Amazon S3 and other cloud 
storage service providers that use the S3 protocol, such as 
Google Cloud Storage or DreamHost DreamObjects. It is best 
suited for power users who are familiar with command line 
programs. It is also ideal for batch scripts and automated 
backup to S3, triggered from cron, etc.

Examples:

-> Pushing file to S3 bucket:

sudo s3cmd put <folder_needs_to_be_pushed>/ s3://<bucket_name> --recursive --acl-public

–acl-public is an extra parameter which is used to set your files publicly accessible.

-> Syncing a local folder with S3 bucket

sudo s3cmd sync --delete-removed --acl-public <folder_needs_to_be_pushed>/ s3://<bucket_name>


Other useful links: 

http://s3tools.org/s3cmd
https://github.com/s3tools/s3cmd