標準入力の複製

標準入力を2つに分ける。

def splitter(source, number = 2)
	pipes = number.times.map{ IO.pipe }
	Thread.fork do
		source.each_line { |line|
			pipes.each{|r, w| w.puts line }
		}
		pipes.each{|r, w| w.close}
	end
	return pipes.map{|r, w| r }
end

src_0, src_1 = splitter($stdin, 2)
src0.each_line { |line| puts line }
src1.each_line { |line| puts line }