gistfile1.rb

require 'twitter'

SEARCH_STR = "#helloworld"
COUNT = 10

client = Twitter::REST::Client.new do |config|
  # you must set up an application using Twitter's developer site, and set these values:
  # (See the Configuration example)
  config.consumer_key        = ""
  config.consumer_secret     = ""
  config.access_token        = ""
  config.access_token_secret = ""
end

opts = { :count => COUNT, :result_type => 'recent' }

client.search(SEARCH_STR, opts).each do |tweet| 
  text = tweet.attrs[:text]
  name = tweet.attrs[:user][:name]
  screen_name = tweet.attrs[:user][:screen_name]
  created_at = tweet.attrs[:created_at]
  puts "#{name} (@#{screen_name}): #{text} [Created #{created_at}]"
end

but after the script show 10 msg, it show also:
/Users/riccardo/.rvm/gems/ruby-2.0.0-p247/gems/twitter-5.5.0/lib/twitter/rest/client.rb:143:in `rescue in request': execution expired (Twitter::Error)
	from /Users/riccardo/.rvm/gems/ruby-2.0.0-p247/gems/twitter-5.5.0/lib/twitter/rest/client.rb:131:in `request'
	from /Users/riccardo/.rvm/gems/ruby-2.0.0-p247/gems/twitter-5.5.0/lib/twitter/rest/client.rb:97:in `get'
	from /Users/riccardo/.rvm/gems/ruby-2.0.0-p247/gems/twitter-5.5.0/lib/twitter/search_results.rb:68:in `fetch_next_page'
	from /Users/riccardo/.rvm/gems/ruby-2.0.0-p247/gems/twitter-5.5.0/lib/twitter/enumerable.rb:13:in `each'
	from hello.rb:17:in `<main>'