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to_i 

        # IO.to_i

(from ruby core)
---
    to_i()

---

Returns the integer file descriptor for the stream:

    $stdin.fileno             # => 0
    $stdout.fileno            # => 1
    $stderr.fileno            # => 2
    File.open('t.txt').fileno # => 10

IO#to_i is an alias for IO#fileno.


(This method is an alias for IO#fileno.)

Returns the integer file descriptor for the stream:

    $stdin.fileno             # => 0
    $stdout.fileno            # => 1
    $stderr.fileno            # => 2
    File.open('t.txt').fileno # => 10

IO#to_i is an alias for IO#fileno.

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