docs: def show_user_variables(input_dict, environment_dict):
    """
    <Purpose>
      Seash callback to allow user to check all variables that they defined.
    <Arguments>
      input_dict: Input dictionary generated by seash_dictionary.parse_command().
      environment_dict: Dictionary describing the current seash environment.
      
      For more information, see command_callbacks.py's module docstring.
    <Side Effects>
      All the variables currently defined will be printed alongside their values.
    <Exceptions>
      None
    <Return>
      None
    """
    for variable, value in uservariables.iteritems():
      print variable+": '"+value+"'"