require "tokenizer.rb"

class Tokenizer
    def self.tokenize(string)
        return string.split(" ")
    end
end

C:Documents and Settingsmysrcfolder>ruby main.rb

C:/Ruby193/lib/ruby/1.9.1/rubygems/custom_require.rb:36:in `require': cannot load such file -- tokenizer.rb (LoadError)
        from C:/Ruby193/lib/ruby/1.9.1/rubygems/custom_require.rb:36:in `require '
        from main.rb:1:in `<main>'

require './tokenizer'

require_relative 'tokenizer'

load './tokenizer.rb'

require_relative 'tokenizer'

$:.unshift('.')

require './tokenizer'

require 'tokenizer'

irb> f = File.new('blabla.rb')
=> #<File:blabla.rb>
irb> f.read
=> "class Tokenizern    def self.tokenize(string)n        return string.split(
" ")n    endnendn"
irb> require f
LoadError: cannot load such file -- blabla.rb
        from D:/dev/Ruby193/lib/ruby/1.9.1/rubygems/custom_require.rb:36:in `req
uire'
        from D:/dev/Ruby193/lib/ruby/1.9.1/rubygems/custom_require.rb:36:in `req
uire'
        from (irb):24
        from D:/dev/Ruby193/bin/irb:12:in `<main>'

irb f = File.new('D://blabla.rb')
=> #<File:D://blabla.rb>
irb f.read
=> "class Tokenizern    def self.tokenize(string)n        return string.split(
" ")n    endnendn"
irb> require f
=> true

require_relative 'tokenizer/main'

require 'roman-numerals.rb'

LoadError: no such file to load -- roman-numerals
  require at org/jruby/RubyKernel.java:1054
  require at /Users/amanoharan/.rvm/rubies/jruby-1.7.4/lib/ruby/shared/rubygems/custom_require.rb:36
   (root) at /Users/amanoharan/Documents/Aptana Studio 3 Workspace/RubyApplication/RubyApplication1/Ruby2.rb:2

require 'roman-numerals'