$ sudo -k

Make sudo forget password instantly

By default sudo 'remembers' password for a few minutes, so that you do
not need to re-enter password for a series of sudo commands that might
follow within a short time duration.

However, sometime you might want sudo to instantly 'forget' the password.

(Next sudo command will need you to reenter the password)  ;-)



-- 
Regards,
Tha.Suresh
http://thasulinux.wordpress.com
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