bucket.rb

def delete_all(prefix)
  puts "delete_all [prefix=#{prefix}, @name=#{@name}]..."
  puts "size: #{AWS::S3::Bucket.objects(@name, :prefix => prefix).size}"
  AWS::S3::Bucket.objects(@name, :prefix => prefix).each do |obj|
    key = obj.key
    result = obj.delete
    puts "  delete #{key}: #{result}"
  end
  puts "sizes: #{AWS::S3::Bucket.objects(@name, :prefix => prefix).size}"
  puts "...done"
end

Typical output

delete_all [prefix=mephisto_production/bin_logs, @name=airbladesoftware]...
size: 2
  delete mephisto_production/bin_logs/mysql-bin.000001: true
size: 1
...done