To set up aws cli check Set up aws cli in Ubuntu/Mac
aws s3 ls
aws s3 cp {fileName} s3://{bucketname}/{folderName}
aws s3 cp {loacl_path} s3://{bucketName}/{folderName} --recursive
aws s3 cp s3://{bucketNamw}/{folderName} /home/thirumal/Downloads
--Download multiple files
aws s3 cp s3://{bucketName}/{folderName} /home/thirumal/Downloads/ --recursive
aws s3 cp {fileName} "s3://{bucketname}/{folderName}"