How to delete all files from S3 Bucket by using command line

It is not obvious how to delete all files (including sub-folders) if you read AWS CLI S3 documentation. But there is a trick by using AWS S3 sync command

1. cd ANY_EMPTY_FOLDER_ON_YOU_COMPUTER

2. aws s3 sync . s3://YOUR-BUCKET-NAME --delete

Be careful! This effectively will empty your AWS S3 Bucket completely. You can do the same for nested folders.