def alias(*aliases):
    """Decorator to add aliases for Cmdln.do_* command handlers.
    
    Example:
        class MyShell(cmdln.Cmdln):
            @cmdln.alias("!", "sh")
            def do_shell(self, argv):
                #...implement 'shell' command
    """
    def decorate(f):
        if not hasattr(f, "aliases"):
            f.aliases = []
        f.aliases += aliases
        return f
    return decorate