diff --git a/lib/ui/subcommand.rb b/lib/ui/subcommand.rb
new file mode 100644
index 0000000..d706f4d
--- /dev/null
+++ b/lib/ui/subcommand.rb
@@ -0,0 +1,100 @@
+class IMICFPS
+  class Commands
+    class Command
+      class SubCommand
+        def initialize(parent, command, type)
+          @parent = parent
+          @command = command
+          @type = type
+        end
+
+        def command
+          @command
+        end
+
+        def handle(arguments, console)
+          if arguments.size > 1
+            console.stdin("to many arguments for #{Style.highlight("#{command}")}, got #{Style.error(arguments.size)} expected #{Style.notice(1)}.")
+            return
+          end
+
+          case @type
+          when :boolean
+            case arguments.last
+            when "", nil
+              var = @parent.get(command.to_sym) ? @parent.get(command.to_sym) : false
+              console.stdin("#{command}: #{Style.highlight(var)}")
+            when "on"
+              var = @parent.set(command.to_sym, true)
+              console.stdin("#{command} => #{Style.highlight(var)}")
+            when "off"
+              var = @parent.set(command.to_sym, false)
+              console.stdin("#{command} => #{Style.highlight(var)}")
+            else
+              console.stdin("Invalid argument for #{Style.highlight("#{command}")}, got #{Style.error(arguments.last)} expected #{Style.notice("on")}, or #{Style.notice("off")}.")
+            end
+          when :string
+            case arguments.last
+            when "", nil
+              var = @parent.get(command.to_sym) ? @parent.get(command.to_sym) : "\"\""
+              console.stdin("#{command}: #{Style.highlight(var)}")
+            else
+              var = @parent.set(command.to_sym, arguments.last)
+              console.stdin("#{command} => #{Style.highlight(var)}")
+            end
+          when :integer
+            case arguments.last
+            when "", nil
+              var = @parent.get(command.to_sym) ? @parent.get(command.to_sym) : "nil"
+              console.stdin("#{command}: #{Style.highlight(var)}")
+            else
+              begin
+                var = @parent.set(command.to_sym, Integer(arguments.last))
+                console.stdin("#{command} => #{Style.highlight(var)}")
+              rescue ArgumentError
+                console.stdin("Error: #{Style.error("Expected an integer, got '#{arguments.last}'")}")
+              end
+            end
+          when :decimal
+            case arguments.last
+            when "", nil
+              var = @parent.get(command.to_sym) ? @parent.get(command.to_sym) : "nil"
+              console.stdin("#{command}: #{Style.highlight(var)}")
+            else
+              begin
+                var = @parent.set(command.to_sym, Float(arguments.last))
+                console.stdin("#{command} => #{Style.highlight(var)}")
+              rescue ArgumentError
+                console.stdin("Error: #{Style.error("Expected a decimal or integer, got '#{arguments.last}'")}")
+              end
+            end
+          else
+            raise RuntimeError
+          end
+        end
+
+        def values
+          case @type
+          when :boolean
+            ["on", "off"]
+          else
+            []
+          end
+        end
+
+        def usage
+          case @type
+          when :boolean
+            "#{Style.highlight(command)} #{Style.notice("[on|off]")}"
+          when :string
+            "#{Style.highlight(command)} #{Style.notice("[string]")}"
+          when :integer
+            "#{Style.highlight(command)} #{Style.notice("[0]")}"
+          when :decimal
+            "#{Style.highlight(command)} #{Style.notice("[0.0]")}"
+          end
+        end
+      end
+    end
+  end
+end
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