s3_upload_sample.rb

require 'aws-sdk'

AWS.config(
  :access_key_id     => 'your_access_key_id',
  :secret_access_key => 'your_secret_access_key',
  :s3_endpoint       => 's3-ap-northeast-1.amazonaws.com' # see http://docs.aws.amazon.com/general/latest/gr/rande.html#s3_region
)

s3 = AWS::S3.new
bucket_name = 'your_bucket/path/to'
bucket = s3.buckets[bucket_name]

path_to = '/path/to'
upload_files = ['file1','file2']
uploaded_files = upload_files.map do |file|
  file     = path_to + "/" + file
  basename = File.basename(file)
  obj      = bucket.objects[basename]
  res = obj.write(:file => file, :acl => :private)
  res.key
end
puts "S3 Upload Success:#{uploaded_files.to_s}"