Ruby/File Directory/IO.flush

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write strings to the stream (buffer) with the 

ios = IO.new( 1, "w" )
ios.puts "IO, IO, it"s off to the computer lab I go."
ios << "Ask not " << "for whom the bells toll." << " -John Donne"
ios.flush # => Ask not for whom the bells toll. -John Donne
Источник — «http://www.wiki.crossplatform.ru/index.php/Ruby/File_Directory/IO.flush»