3 files changed, 77 insertions, 0 deletions
diff --git a/ruby/grep.rb b/ruby/grep.rb
new file mode 100755
index 0000000..61d60b0
--- /dev/null
+++ b/ruby/grep.rb
@@ -0,0 +1,17 @@
+#!/usr/bin/env ruby
+
+exit 1 if ARGV.size < 2
+
+pattern = ARGV[0]
+
+ARGV[1..-1].each do |fname|
+	unless File.file?(fname)
+		puts "File #{fname} does not exist or is a directory"
+		exit 1
+	end
+	File.open(fname, 'r') do |f|
+		f.each_line do |line|
+			puts "#{f.lineno}:\t#{line}" if line =~ /#{pattern}/
+		end
+	end
+end
diff --git a/ruby/to_file.rb b/ruby/to_file.rb
new file mode 100755
index 0000000..5b6967f
--- /dev/null
+++ b/ruby/to_file.rb
@@ -0,0 +1,24 @@
+#!/usr/bin/env ruby
+
+module ToFile
+	def filename
+		"object_#{self.object_id}.txt"
+	end
+	def to_f
+		File.open(filename, 'w') {|f| f.write(to_s)}
+	end
+end
+
+class Person
+	include ToFile
+	attr_accessor :name
+
+	def initialize(name)
+		@name = name
+	end
+	def to_s
+		name
+	end
+end
+
+Person.new("matz").to_f
diff --git a/ruby/tree.rb b/ruby/tree.rb
new file mode 100755
index 0000000..364917e
--- /dev/null
+++ b/ruby/tree.rb
@@ -0,0 +1,36 @@
+#!/usr/bin/env ruby
+
+class Tree
+	attr_accessor :name, :children
+	def initialize(hash = {})
+		pair = hash.first
+		if pair
+			@name = pair[0]
+			@children = []
+			pair[1].each do |key, value|
+				@children.push(Tree.new( {key => value} ))
+			end
+		else
+			@name = nil
+			@children = nil
+		end
+	end
+
+	def visit_all(&block)
+		visit(&block)
+		children.each {|x| x.visit_all(&block) if x}
+	end
+
+	def visit(&block)
+		block.call self
+	end
+end
+
+ruby_tree = Tree.new({"Ruby" => {"Reia" => {"MacRuby" => {}}, "Waka" => {"Blr" => {}}}})
+
+puts "Visiting a node"
+ruby_tree.visit {|node| puts node.name}
+puts
+
+puts "Visiting entire tree"
+ruby_tree.visit_all {|node| puts node.name}