diff --git a/bin/example.rb b/bin/example.rb
index 963ad32..03787b4 100755
--- a/bin/example.rb
+++ b/bin/example.rb
@@ -5,15 +5,23 @@ $:.unshift Pathname.new(__FILE__).dirname.dirname.join('lib').to_s
 require 'dencli'
 
 cli = DenCli.new 'example', "This is an example for generate a DenCli-API"
-cli.cmd( :example, "I have an example command") { STDERR.puts "This is an example" }
-cli.cmd( :help, "", aliases: [nil, '-h', '--help']) {|*args| STDERR.puts cli.help(*args) }
-
 cli.cmd( :args, "Expects and prints given arguments", &lambda {|a, b, c:, d:, e:|
 		p a: a, b: b, c: c, d: d, e: e
 	}).
 	opt( :c, '-c=ForC', "Option c").
 	opt( :d, '-d=ForD', "Option d", default: "something").
-	opt( :e, '-e', "Toggle e", default: false)
+	opt( :e, '-e', "Toggle e", default: false).
+	opt( :f, '--[no-]f', "Toggle f", default: false)
+
+cli.cmd( :example, "I have an example command") { STDERR.puts "This is an example" }
+cli.cmd( :help, "", aliases: [nil, '-h', '--help'], &lambda {|*args, full:|
+	if full
+		cli.help_full *args, output: STDERR
+	else
+		cli.help *args, output: STDERR
+	end
+}).
+	opt( :full, '-f', '--[no-]full', "Print all commands and sub-commands.", default: false)
 
 cli.sub( :more, "Sub-Commands are also possible with a new cli") do |sub|
 	sub.cmd( :help, "", aliases: [nil, '-h', '--help']) {|*args| STDERR.puts sub.help(*args) }
@@ -29,7 +37,7 @@ cli.sub( :more, "Sub-Commands are also possible with a new cli") do |sub|
 		opt( :e, '-e', "Toggle e")
 
 	sub.sub( :deeper, "You want to have Sub-Sub-Commands?") do |sub2|
-		sub2.cmd( :help, "", aliases: [nil, '-h', '--help'], &lambda {|*args| STDERR.puts sub2.help(*args) })
+		sub2.cmd( :help, "", aliases: [nil, '-h', '--help'], &lambda {|*args| sub2.help( *args, output: STDERR) })
 		sub2.cmd( :last, "The last example", &lambda { STDERR.puts "The last example" })
 
 		sub2.sub( :'sub-commands', "Endless Sub-Sub- ...") do |sub3|
diff --git a/lib/dencli.rb b/lib/dencli.rb
index 4f4781c..7681856 100755
--- a/lib/dencli.rb
+++ b/lib/dencli.rb
@@ -80,8 +80,22 @@ class DenCli
 		@subs.call *a
 	end
 
-	def help *args
-		@subs.help *args
+	def usage *args, **opts
+		@subs.usage *args, **opts
+	end
+
+	def help *args, **opts
+		@subs.help *args, **opts
+	end
+
+	def help_full *args, output: nil
+		output ||= STDOUT
+		x = @subs.goto *args
+		_help_full output, x
+	end
+
+	def _help_full output, subs
+		Sub._help_commands output, subs.to_enum( :commands)
 	end
 
 	def [] k
diff --git a/lib/dencli/cmd.rb b/lib/dencli/cmd.rb
index f7cd0f8..12cad0a 100644
--- a/lib/dencli/cmd.rb
+++ b/lib/dencli/cmd.rb
@@ -23,10 +23,11 @@ class DenCli::CMD
 	def options_required() @exe.parameters.select {|e| :keyreq == e[0] }.map {|e| e[1] } end
 	def options_additional() @exe.parameters.select {|e| :key == e[0] }.map {|e| e[1] } end
 
-	def help() "Usage: #{usage}\n#{description}\n#{options_help}" end
-	def complete( *pre, str) @completion.call *pre, str end
+	def complete *pre, str
+		@completion.call *pre, str
+	end
 
-	def call( *as)
+	def call *as
 		os = {}
 		unless @options.empty?
 			# options like --abc | -x will be provided in os
@@ -53,25 +54,58 @@ class DenCli::CMD
 			end
 			kr = @options.select {|_, o| o.required? and not os.has_key? o.name }
 			unless kr.empty?
-				raise DenCli::UsageError, "Missing argument(s): #{kr.map {|o| o.as.first }.join ', '}"
+				raise DenCli::UsageError, "Missing argument(s): #{kr.map {|o| o.long || o.short }.join ', '}"
 			end
 		end
 		@exe.call *as, **os
 	end
 
-	def usage
-		args =
-			@options.map do |_, o|
-				s = "#{o.short}#{o.val ? ?= : ''}#{o.val}"; o.required? ? "#{s} " : "[#{s}] "
-			end
-		"#{full_cmd.join ' '}  #{args.join ''}"+
-			(@exe.lambda? ? (
-				required.map{|s|"<#{s}>"}.join( " ")+
-				(additional.empty? ? "" : " [#{additional.map{|s|"<#{s}>"}.join " "}]")
-			) : '...')
+	def usage output: nil
+		output ||= ''
+		_usage output
+		output
 	end
 
-	def options_help
+	def _usage output
+		output << full_cmd.join( ' ')
+		@options.each do |_, o|
+			s = "#{o.short||o.long}#{o.val ? ?= : ''}#{o.val}"
+			output << (o.required? ? " #{s}" : " [#{s}]")
+		end
+		if @exe.lambda?
+			required.each {|s| output << " <#{s}>" }
+			output << " [#{additional.map{|s|"<#{s}>"}.join " "}]"  unless additional.empty?
+		else
+			output << ' ...'
+		end
+	end
+
+	def commands *args, &exe
+		yield self
+	end
+
+	def goto *args
+		self
+	end
+
+	def help output: nil
+		output ||= ''
+		_help output
+		output
+	end
+
+	def _help output
+		output << "Usage: #{usage}\n#{description}\n"
+		_help_options output
+	end
+
+	def help_options output: nil
+		output ||= ''
+		_help_options output
+		output
+	end
+
+	def _help_options output
 		sc, lc, dc = 0, 0, 0
 		@options.each do |_, o|
 			s = o.short&.length || 0
@@ -89,8 +123,8 @@ class DenCli::CMD
 			end
 			dc = d  if dc < d
 		end
-		format = "  %-#{sc}s%s %-#{lc}s %s"
-		@options.map {|_, o|
+		format = "  %-#{sc}s%s %-#{lc}s %s\n"
+		@options.map do |_, o|
 			s, l, v, y = o.short, o.long, o.val, ','
 			if l.nil?
 				s += "=#{v}"  if v
@@ -101,8 +135,8 @@ class DenCli::CMD
 			end
 			d = o.desc || ''
 			d += " (#{o.default})"  if o.default?
-			format % [ s, y, l, d ]
-		}.join "\n"
+			output << format % [ s, y, l, d ]
+		end
 	end
 
 	def completion &exe
@@ -116,34 +150,29 @@ class DenCli::CMD
 		def default?() NilClass != @default end
 		def default() NilClass == @default ? nil : @default end
 
-		def initialize cmd, name, opt, *alts, desc, default: NilClass, **os, &conv
-			long = short = val = nil
+		def parse_opt_string opt
 			case opt
-			when /\A(--[^=-]+)=(.+)\z/
-				long, val = $1, $2
-			when /\A(--[^=-]+)\z/
-				long, val = $1, nil
+			when /\A(--\[no-\][^=]+)\z/
+				@long, @val = $1, nil
+			when /\A(--[^=]+)=(.+)\z/
+				@long, @val = $1, $2 || @val
+			when /\A(--[^=]+)\z/
+				@long, @val = $1, nil
 			when /\A(-[^=-]+)=(.+)\z/
-				short, val = $1, $2
+				@short, @val = $1, $2 || @val
 			when /\A(-[^=-]+)\z/
-				short, val = $1, nil
-			else raise ArgumentError, "Unexpected format for option: #{opt.inspect}"
+				@short, @val = $1, nil
+			else
+				raise ArgumentError, "Unexpected format for option: #{opt.inspect}"
 			end
-			alts.each do |alt|
-				case alt
-				when /\A(--[^=-]+)=(.+)\z/
-					long, val = $1, val || $2
-				when /\A(--[^=-]+)\z/
-					long, val = $1, nil
-				when /\A(-[^=-]+)=(.+)\z/
-					short, val = $1, val || $2
-				when /\A(-[^=-]+)\z/
-					short, val = $1, nil
-				else raise ArgumentError, "Unexpected format for option: #{alt.inspect}"
-				end
-			end
-			@name, @short, @long, @val, @desc, @default, @os, @conv =
-				name.to_s.to_sym, short, long, val, desc, default, os, conv || lambda{|v|v}
+		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
+			parse_opt_string opt
+			alts.each &method( :parse_opt_string)
 			@req =
 				if NilClass != default
 					false
@@ -155,6 +184,7 @@ class DenCli::CMD
 		end
 
 		def on parser, store
+			store[@name] = @default  if default?
 			parser.on "#{@short}#{@val ? ?= : ''}#{@val}", "#{@long}#{@val ? ?= : ''}#{@val}", **@os do |val|
 				store[@name] = @conv[val]
 			end
diff --git a/lib/dencli/sub.rb b/lib/dencli/sub.rb
index 5622d69..c52ddc7 100644
--- a/lib/dencli/sub.rb
+++ b/lib/dencli/sub.rb
@@ -15,16 +15,72 @@ class DenCli::Sub
 		"#{full_cmd.join ' '} ..."
 	end
 
-	def help n = nil, *a
+	def help n = nil, *a, output: nil
+		output ||= ''
+		_help output, n, *a
+		output
+	end
+
+	def _help output, n = nil, *a
 		if n.nil?
-			r = "#{full_cmd.join ' '}: #{description}\n\n"
-			m = @subs.map {|k,c| k.nil? ? 0 : c.usage.length }.max
-			@subs.each do |k, c|
-				r += "  % -#{m}s  %s\n" % [c.usage, c.description]  unless k.nil?
-			end
-			r
+			output << "#{full_cmd.join ' '}: #{description}\n\n"
+			self.class._help_commands output, @subs
 		elsif @aliases.has_key? n
-			@aliases[n].help *a
+			@aliases[n]._help output, *a
+		else
+			raise DenCli::UnknownCommand, "unknown command: #{_full_cmd( [n])[1..-1].join ' '}, available for #{full_cmd[1..-1].join' '}: #{@subs.keys.join ' '}"
+		end
+	end
+
+	def commands &exe
+		yield self
+		@subs.each {|k, c| c.commands &exe }
+	end
+
+	def help_commands output: nil
+		output ||= ''
+		self.class._help_commands output, subs.map {|_,c| c}
+		output
+	end
+
+	def self._help_commands output, subs
+		m = subs.map {|c| x = c.usage.length; 25 < x ? 0 : x }.max
+		subs.each do |c|
+			if 25 < c.usage.length
+				output << "% -#{m}s\n#{' ' * m} " % [c.usage]
+			else
+				output << "% -#{m}s " % [c.usage]
+			end
+			n = m+2
+			prefix = nil
+			c.description.split /\n/ do |l|
+				c = 0
+				l.split %r< > do |w|
+					if prefix
+						output << prefix
+						prefix = nil
+					end
+					wl = w.length
+					if 75 < c+wl
+						output << "\n#{' ' * n}#{w}"
+						c = n+2+wl
+					else
+						output << " #{w}"
+						c += 1 + wl
+					end
+				end
+				prefix = "\n#{' ' * n}"
+			end
+			output << "\n"
+		end
+		output
+	end
+
+	def goto *a
+		return self  if a.empty?
+		n, *a = *a
+		if @aliases.has_key? n
+			@aliases[n].goto *a
 		else
 			raise DenCli::UnknownCommand, "unknown command: #{_full_cmd( [n])[1..-1].join ' '}, available for #{full_cmd[1..-1].join' '}: #{@subs.keys.join ' '}"
 		end