This is a Ruby tree! It shows every object from the Ruby Programming Language in a tree format.

lineno 

        # IO.lineno

(from ruby core)
---
    ios.lineno    -> integer

---

Returns the current line number in *ios*.  The stream must be opened for
reading. #lineno counts the number of times #gets is called rather than
the number of newlines encountered.  The two values will differ if #gets
is called with a separator other than newline.

Methods that use `$/` like #each, #lines and #readline will also
increment #lineno.

See also the `$.` variable.

    f = File.new("testfile")
    f.lineno   #=> 0
    f.gets     #=> "This is line one\n"
    f.lineno   #=> 1
    f.gets     #=> "This is line two\n"
    f.lineno   #=> 2

This is MURDOC! A Ruby documentation browser inspired by Smalltalk-80. It allows you to learn about Ruby by browsing through its class hierarchies, and see any of its methods.