Date: Tue, 5 May 2009 11:36:41 +0100 From: Frank Shute <frank@shute.org.uk> To: Mike Clarke <jmc-freebsd2@milibyte.co.uk> Cc: freebsd-questions@freebsd.org Subject: Re: clear old output in login screen? Message-ID: <20090505103641.GA62529@melon.esperance-linux.co.uk> In-Reply-To: <200905050945.16910.jmc-freebsd2@milibyte.co.uk> References: <fa8771800905031146v51a8b752ra125f68a2520da4f@mail.gmail.com> <200905041018.00717.jmc-freebsd2@milibyte.co.uk> <49fff6e5.JdJRbLiNeEolnKU2%perryh@pluto.rain.com> <200905050945.16910.jmc-freebsd2@milibyte.co.uk>
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On Tue, May 05, 2009 at 09:45:16AM +0100, Mike Clarke wrote:
>
> On Tuesday 05 May 2009, perryh@pluto.rain.com wrote:
>
> > Mike Clarke <jmc-freebsd2@milibyte.co.uk> wrote:
> > > On Monday 04 May 2009, perryh@pluto.rain.com wrote:
> >
> > ...
> >
> > > > ? #!/bin/csh
> > > > ? clear
> > > > ? vidcontrol -C
> > > > ? exec /usr/bin/login.real "$@"
> > >
> > > But this wouldn't prevent someone scrolling back with the scroll
> > > lock key before logging in. I assume the OP's requirement is to
> > > stop people from seeing previous users console activity.
> >
> > That's what the "vidcontrol -C" line is supposed to accomplish,
> > based on my reading of vidcontrol(1) and earlier messages in the
> > thread. Granted I have not actually tried it.
>
> Yes, "vidcontrol -C" will accomplish this, but my point was that
> including this as part of the replacement login script is too late. You
> don't need to be logged in to use the scroll lock and pg{Up,Dn} keys.
> To prevent people seeing the previous users activity you would need to
> clear the console buffer at the logout stage.
>
I see what you mean.
Perhaps put vidcontrol -C in /etc/csh.logout
For other shells e.g ksh:
alias logout='~/.ksh_logout; exit'
(not tested)
It seems that for sh, logout is a builtin but it's not mentioned in
it's manpage.
Regards,
--
Frank
Contact info: http://www.shute.org.uk/misc/contact.html
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