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each_char 

        # IO.each_char

(from ruby core)
---
    ios.each_char {|c| block }  -> ios
    ios.each_char               -> an_enumerator

---

Calls the given block once for each character in *ios*, passing the
character as an argument. The stream must be opened for reading or an
IOError will be raised.

If no block is given, an enumerator is returned instead.

    f = File.new("testfile")
    f.each_char {|c| print c, ' ' }   #=> #<File:testfile>

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