diff --git a/bin/example.rb b/bin/example.rb
index 006c188..2575dc7 100755
--- a/bin/example.rb
+++ b/bin/example.rb
@@ -1,10 +1,9 @@
 #!/usr/bin/env ruby
 
 require 'pathname'
-$:.unshift Pathname.new(__FILE__).dirname.dirname.join('lib').to_s
-require 'dencli'
 require 'shellwords'
 require 'stringio'
+require_relative '../lib/dencli'
 
 cli = DenCli.new :example, "This is an example for generate a DenCli-API"
 
@@ -33,8 +32,8 @@ class Capture
 		STDERR.printf "[% 4d] \e[1;35m? \e[0m %s tests %s\r", @counter, $0.shellescape, command.shelljoin
 	end
 
-	def logok command
-		STDERR.printf "[% 4d] \e[1;32mok\e[0m %s tests %s\e[J\n", @counter, $0.shellescape, command.shelljoin
+	def logok info, command
+		STDERR.printf "[% 4d] \e[1;32mok\e[0m %s | %s tests %s\e[J\n", @counter, info, $0.shellescape, command.shelljoin
 	end
 
 	def logfail command
@@ -54,7 +53,7 @@ class Capture
 		logstart command
 		$capture.capture { @cli.call 'tests', *command }
 		if expect === @args
-			logok command
+			logok @args, command
 		else
 			logfail command
 			loginfo "expected args: #{expect.inspect}"
@@ -63,7 +62,7 @@ class Capture
 		end
 	rescue SystemExit
 		if 0 == $!.status
-			logok command
+			logok @args, command
 		else
 			logfail command
 		end
@@ -79,7 +78,7 @@ class Capture
 		logfail command
 	rescue exception
 		if message === $!.message
-			logok command
+			logok exception, command
 			if @verbose
 				logexception "raised:", $!
 				STDERR.puts
@@ -96,6 +95,14 @@ class Capture
 end
 
 cli.sub :tests, "Some tests", noshortaliases: true do |tcli|
+	OptionParser.accept IPAddr do |arg|
+		begin
+			IPAddr.new arg
+		rescue IPAddr::InvalidAddressError
+			raise OptionParser::InvalidArgument, "#{$!.message}: #{arg}"
+		end
+	end
+
 	tcli.cmd( :'-', "No arguments no options expected", &lambda {|| $capture.args = [] })
 	tcli.cmd( :'arg', "", &lambda {|one| $capture.args = [one] })
 	tcli.cmd( :'oar', "", &lambda {|one=nil| $capture.args = [one] })
@@ -109,6 +116,7 @@ cli.sub :tests, "Some tests", noshortaliases: true do |tcli|
 	tcli.cmd( :'str', '', &lambda {|a:| $capture.args = [a] }).opt(:a, '-a=STR', '')
 	tcli.cmd( :'lstr', '', &lambda {|a:| $capture.args = [a] }).opt(:a, '--astr=STR', '')
 	tcli.cmd( :'bstr', '', &lambda {|a:| $capture.args = [a] }).opt(:a, '-a', '--astr=STR', '')
+	tcli.cmd( :'ipaddr', '', &lambda {|a:| $capture&.args = [a] }).opt(:a, '-a', '--addr=ADDR', IPAddr, '')
 
 	tcli.cmd( :run, "Run all tests") do |verbose:|
 		$capture = Capture.new cli, verbose: verbose
@@ -187,6 +195,9 @@ cli.sub :tests, "Some tests", noshortaliases: true do |tcli|
 		$capture.should_fail OptionParser::InvalidOption, //, 'bstr', '-b'
 		$capture.should_fail OptionParser::InvalidOption, //, 'bstr', '--unexpected'
 		$capture.should_fail DenCli::UsageError, //, 'bstr', 'unexpected'
+
+		$capture.should_ok [IPAddr.new('1.2.3.4')], 'ipaddr', '-a', '1.2.3.4'
+		$capture.should_fail OptionParser::InvalidArgument, /invalid address/, 'ipaddr', '-a', '1.2.3.400'
 	end.opt( :verbose, '-v', 'Prints additional information per test', default: false)
 end
 
diff --git a/lib/dencli/cmd.rb b/lib/dencli/cmd.rb
index f057b2d..e16385d 100644
--- a/lib/dencli/cmd.rb
+++ b/lib/dencli/cmd.rb
@@ -160,7 +160,7 @@ class DenCli::CMD
 	end
 
 	class Opt
-		attr_reader :name, :long, :short, :val, :desc, :os, :conv, :req
+		attr_reader :name, :long, :short, :type, :val, :desc, :conv, :req
 		def required?() @req end
 		def default?() NilClass != @default end
 		def default() NilClass == @default ? nil : @default end
@@ -183,11 +183,12 @@ class DenCli::CMD
 		end
 		private :parse_opt_string
 
-		def initialize cmd, name, opt, *alts, desc, default: NilClass, **os, &conv
-			@name, @desc, @default, @os, @conv, @val =
-				name.to_s.to_sym, desc, default, os, conv || lambda{|v|v}, nil
+		def initialize cmd, name, opt, *args, desc, default: NilClass, &conv
+			@name, @desc, @default, @conv, @val, @type =
+				name.to_s.to_sym, desc, default, conv || lambda{|v|v}, nil, nil
 			parse_opt_string opt
-			alts.each &method( :parse_opt_string)
+			@type = args.pop  if OptionParser.top.atype.has_key? args.last
+			args.each &method( :parse_opt_string)
 			@req =
 				if NilClass != default
 					false
@@ -200,30 +201,32 @@ class DenCli::CMD
 
 		def on parser, store
 			store[@name] = @default  if default?
-			parser.on "#{@short}#{@val ? ?= : ''}#{@val}", "#{@long}#{@val ? ?= : ''}#{@val}", **@os do |val|
+			short = "#{@short}#{@val ? ?= : ''}#{@val}"
+			long = "#{@long}#{@val ? ?= : ''}#{@val}"
+			parser.on short, long, *[@type].compact do |val|
 				store[@name] = @conv[val]
 			end
 		end
 
 		def inspect
-			"#<%s:0x%016x %s %s %s %s (%p) %p os=%p conv=%s>" % [
+			"#<%s:0x%x %s %s %s %s (%p) %p conv=%s>" % [
 				self.class.name, object_id, @req ? "<#{@name}>" : "[#{@name}]",
-				@short, @long, @val, @default, @desc, @os,
+				@short, @long, @val, @default, @desc, @type ? " type=#{type}" : '',
 				@exe ? "<#{@exe.lambda? ? :lambda: :proc} ##{@exe.arity}>" : "nil"
 			]
 		end
 	end
 
-	def opt name, opt, *alts, desc, **os, &conv
-		r = Opt.new( self, name, opt, *alts, desc, **os, &conv)
+	def opt name, opt, *args, desc, &conv
+		r = Opt.new( self, name, opt, *args, desc, &conv)
 		@options[r.name] = r
 		self
 	end
 
 	def inspect
-		"#<%s:0x%x %s @name=%p @description=%p @parent=<%s:0x%x %s> @exe=<arity=%d>>" % [
+		"#<%s:0x%x %s @name=%p @description=%p @options=%p @parent=<%s:0x%x %s> @exe=<arity=%d>>" % [
 			self.class.name, self.object_id, self.full_cmd,
-			@name, @description, @parent.class.name, @parent.class.object_id, @parent.full_cmd,
+			@name, @description, @options.values, @parent.class.name, @parent.class.object_id, @parent.full_cmd,
 			@exe.arity
 		]
 	end