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each 

        # IO.each

(from ruby core)
---
    ios.each(sep=$/ [, getline_args])          {|line| block } -> ios
    ios.each(limit [, getline_args])           {|line| block } -> ios
    ios.each(sep, limit [, getline_args])      {|line| block } -> ios
    ios.each(...)                             -> an_enumerator
    ios.each_line(sep=$/ [, getline_args])     {|line| block } -> ios
    ios.each_line(limit [, getline_args])      {|line| block } -> ios
    ios.each_line(sep, limit [, getline_args]) {|line| block } -> ios
    ios.each_line(...)                        -> an_enumerator

---

Executes the block for every line in *ios*, where lines are separated by
*sep*. *ios* 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 {|line| puts "#{f.lineno}: #{line}" }

*produces:*

    1: This is line one
    2: This is line two
    3: This is line three
    4: And so on...

See IO.readlines for details about getline_args.

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