clear old output in login screen?

[jw]

On Sun, May 3, 2009 at 12:48 PM, gabe g <johndoeismyname at gmail.com> wrote:
> Hey John,
>       In order to achieve this, there are two methods that I know of,
> however, they are only tested in the Bourne and Bourne Again shells.
>
> clear && logout                 # Bourne Again (Bash) Shell
> clear && exit                     # Bourne (sh) Shell
>

I tried this, but I can still scroll back with the scroll lock key.
'clear' seems to just put the prompt at the top of the screen, not get
rid of scroll history...

-John