If you want to reset options to their default values from RSH, you must precede the quotation characters (") with the escape character, which is the backslash (\).
For example, to reset the CIFS home directory path from a Windows host using a console session, you would enter the following command: c:\> toaster options cifs.home_dir ""
However, from an RSH session, you must enter the following command: c:\> rsh toaster options cifs.home_dir \"\"