mongo-ruby-driver/test/mongo-qa/gridfs_out

#!/usr/bin/env ruby

require File.join(File.dirname(__FILE__), '_common.rb')

require 'mongo/gridfs'
include GridFS

db = Connection.new(DEFAULT_HOST, DEFAULT_PORT).db(DEFAULT_DB)

input_file = ARGV[0]
output_file = ARGV[1]

File.open(output_file, "w") { |f|
  GridStore.open(db, input_file, "r") { |g|
    f.write(g.read)
  }
}