read_multiple_streams.rb

# Example: ruby read_multiple_streams.rb a <(for x in $(seq 10); do echo $x; sleep 1; done) <(echo bs98dfh8dhf9dshfdshf9shdf98shd98fshd98fhs98fhds) asdf <(sleep 2; echo ababababababababababababababababababababab)

io_objects = []

ARGV.each do |arg|
  if arg =~ /^\/dev\/fd\/[0-9]+$/
    io_objects << IO.new(IO.sysopen(arg))
  end
end
ARGV.clear

io_objects.delete_if {|io| io.eof? }

until io_objects.empty? do
  ready_io_objects = IO.select(io_objects)[0]
  ready_io_objects.each do |io|
    puts io.read_nonblock 10
  end
  io_objects.delete_if {|io| io.eof? }
end