Ruby/File Directory/IO.close

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close the stream with close.

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
ios.close
Источник — «http://wiki.crossplatform.ru/index.php?title=Ruby/File_Directory/IO.close»