test what the numeric file descriptor is for your I/O stream (to_i also works). : IO.fileno « File Directory « Ruby

1. Ruby
2. File Directory
3. IO.fileno

test what the numeric file descriptor is for your I/O stream (to_i also works).

ios = IO.new( 1, "w" )

ios.puts "IO, IO, it's off to the computer lab I go."

ios.fileno # => 1
ios.to_i # => 1

$stdout.fileno # => 1

 

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