Fix added for #78

Gracefully fail command line with unknown option
https://github.com/beefproject/beef/issues/78

Now the framework suggests the user runs --help

extensions/console/commandline.rb

@@ -14,43 +14,49 @@
 #   limitations under the License.
 #
 module BeEF
-module Extension
-module Console
-  #
-  # This module parses the command line argument when running beef.
-  #
-  module CommandLine
-    
-    @options = Hash.new
-    @options[:verbose] = false
-    @options[:resetdb] = false
-    
-    @already_parsed = false
-    
-    #
-    # Parses the command line arguments of the console.
-    # It also populates the 'options' hash.
-    #
-    def self.parse
-      return @options if @already_parsed
-      
-      optparse = OptionParser.new do |opts|
-        opts.on('-x', '--reset', 'Reset the database') do
-          @options[:resetdb] = true
-        end
-        
-        opts.on('-v', '--verbose', 'Display debug information') do
-          @options[:verbose] = true
+  module Extension
+    module Console
+      #
+      # This module parses the command line argument when running beef.
+      #
+      module CommandLine
+
+        @options = Hash.new
+        @options[:verbose] = false
+        @options[:resetdb] = false
+
+        @already_parsed = false
+
+        #
+        # Parses the command line arguments of the console.
+        # It also populates the 'options' hash.
+        #
+        def self.parse
+          return @options if @already_parsed
+
+          begin
+          optparse = OptionParser.new do |opts|
+            opts.on('-x', '--reset', 'Reset the database') do
+              @options[:resetdb] = true
+            end
+
+            opts.on('-v', '--verbose', 'Display debug information') do
+              @options[:verbose] = true
+            end
+          end
+
+
+          optparse.parse!
+          @already_parsed = true
+          @options
+          rescue OptionParser::InvalidOption => e
+            puts "Invalid command line option provided. Please run beef --help"
+            exit 1
+          end
         end
+
       end
-      
-      optparse.parse!
-      @already_parsed = true
-      @options
+
     end
-    
   end
-  
-end
-end
 end