diff --git a/cli/topic_common.py b/cli/topic_common.py
index 25d76dd..9604dc0 100644
--- a/cli/topic_common.py
+++ b/cli/topic_common.py
@@ -413,6 +413,7 @@
         self.kill_on_failure = False
         self.web_server = ''
         self.verbose = False
+        self.no_confirmation = False
         # Whether the topic or command supports skylab inventory repo.
         self.allow_skylab = False
         self.enforce_skylab = False
@@ -433,9 +434,9 @@
                                help='Delimiter to use to separate the '
                                'key=value fields', default='|')
         self.parser.add_option('--no-confirmation',
-                               help='Skip prompt_confirmation from the user',
-                               action='store_true',
-                               default=False)
+                               help=('Skip all confirmation in when function '
+                                     'require_confirmation is called.'),
+                               action='store_true', default=False)
         self.parser.add_option('-v', '--verbose',
                                action='store_true', default=False)
         self.parser.add_option('-w', '--web',
@@ -740,6 +741,41 @@
         return KEYS_CONVERT.get(type, str)(value)
 
 
+    def print_fields_std(self, items, keys, title=None):
+        """Print the keys in each item, one on each line.
+
+        @param items: Items to print.
+        @param keys: Name of the keys to look up each item in items.
+        @param title: Title of the output, default to None.
+        """
+        if not items:
+            return
+        if title:
+            print(title)
+        for item in items:
+            for key in keys:
+                print('%s: %s' % (KEYS_TO_NAMES_EN[key],
+                                  self.__conv_value(key,
+                                                    _get_item_key(item, key))))
+
+
+    def print_fields_parse(self, items, keys, title=None):
+        """Print the keys in each item as comma separated name=value
+
+        @param items: Items to print.
+        @param keys: Name of the keys to look up each item in items.
+        @param title: Title of the output, default to None.
+        """
+        for item in items:
+            values = ['%s=%s' % (KEYS_TO_NAMES_EN[key],
+                                  self.__conv_value(key,
+                                                    _get_item_key(item, key)))
+                      for key in keys
+                      if self.__conv_value(key,
+                                           _get_item_key(item, key)) != '']
+            print(self.parse_delim.join(values))
+
+
     def __find_justified_fmt(self, items, keys):
         """Find the max length for each field.
 
@@ -806,6 +842,96 @@
                 print('\n')
 
 
+    def print_table_parse(self, items, keys_header, sublist_keys=()):
+        """Print a mix of header and lists in a user readable format.
+
+        @param items: Items to print.
+        @param keys_header: Header of the keys, use to look up in items.
+        @param sublist_keys: Keys for sublist in each item.
+        """
+        for item in items:
+            values = ['%s=%s' % (KEYS_TO_NAMES_EN[key],
+                                 self.__conv_value(key, _get_item_key(item, key)))
+                      for key in keys_header
+                      if self.__conv_value(key,
+                                           _get_item_key(item, key)) != '']
+
+            if sublist_keys:
+                [values.append('%s=%s'% (KEYS_TO_NAMES_EN[key],
+                                         ','.join(_get_item_key(item, key))))
+                 for key in sublist_keys
+                 if len(_get_item_key(item, key))]
+
+            print(self.parse_delim.join(values))
+
+
+    def print_by_ids_std(self, items, title=None, line_before=False):
+        """Prints ID & names of items in a user readable form.
+
+        @param items: Items to print.
+        @param title: Title of the output, default to None.
+        @param line_before: True to print an empty line before the output,
+                            default to False.
+        """
+        if not items:
+            return
+        if line_before:
+            print()
+        if title:
+            print(title + ':')
+        self.print_table_std(items, keys_header=['id', 'name'])
+
+
+    def print_by_ids_parse(self, items, title=None, line_before=False):
+        """Prints ID & names of items in a parseable format.
+
+        @param items: Items to print.
+        @param title: Title of the output, default to None.
+        @param line_before: True to print an empty line before the output,
+                            default to False.
+        """
+        if not items:
+            return
+        if line_before:
+            print()
+        if title:
+            print(title + '='),
+        values = []
+        for item in items:
+            values += ['%s=%s' % (KEYS_TO_NAMES_EN[key],
+                                  self.__conv_value(key,
+                                                    _get_item_key(item, key)))
+                       for key in ['id', 'name']
+                       if self.__conv_value(key,
+                                            _get_item_key(item, key)) != '']
+        print(self.parse_delim.join(values))
+
+
+    def print_list_std(self, items, key):
+        """Print a wrapped list of results
+
+        @param items: Items to to lookup for given key, could be a nested
+                      dictionary.
+        @param key: Name of the key to look up for value.
+        """
+        if not items:
+            return
+        print(' '.join(_get_item_key(item, key) for item in items))
+
+
+    def print_list_parse(self, items, key):
+        """Print a wrapped list of results.
+
+        @param items: Items to to lookup for given key, could be a nested
+                      dictionary.
+        @param key: Name of the key to look up for value.
+        """
+        if not items:
+            return
+        print('%s=%s' % (KEYS_TO_NAMES_EN[key],
+                         ','.join(_get_item_key(item, key) for item in items)))
+
+
     @staticmethod
     def prompt_confirmation(message=None):
         """Prompt a question for user to confirm the action before proceeding.
@@ -824,3 +950,36 @@
         else:
             print('User did not confirm. Aborting...')
             return False
+
+
+    @staticmethod
+    def require_confirmation(message=None):
+        """Decorator to prompt a question for user to confirm action before
+        proceeding.
+
+        If user chooses not to proceed, do not call the function.
+
+        @param message: A detailed message to explain possible impact of the
+                        action.
+
+        @return: A decorator wrapper for calling the actual function.
+        """
+        def deco_require_confirmation(func):
+            """Wrapper for the decorator.
+
+            @param func: Function to be called.
+
+            @return: the actual decorator to call the function.
+            """
+            def func_require_confirmation(*args, **kwargs):
+                """Decorator to prompt a question for user to confirm.
+
+                @param message: A detailed message to explain possible impact of
+                                the action.
+                """
+                if (args[0].no_confirmation or
+                    atest.prompt_confirmation(message)):
+                    func(*args, **kwargs)
+
+            return func_require_confirmation
+        return deco_require_confirmation