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Date:      Sat, 03 Jun 2000 18:43:41 -0400
From:      "Thomas M. Sommers" <tms2@mail.ptd.net>
To:        Rahul Siddharthan <rsidd@physics.iisc.ernet.in>
Cc:        gh <grasshacker@linkfast.net>, chat@FreeBSD.ORG
Subject:   Re: Why encourage stupid people to use *BSD WAS:Re: IE
Message-ID:  <39398A1D.5BAC99F1@mail.ptd.net>
References:  <200006021842.LAA24897@usr09.primenet.com> <393855D9.F5F0E5F0@mail.ptd.net> <20000603095822.A13686@physics.iisc.ernet.in> <011b01bfcd75$3706e650$2969a0d0@leviathan> <20000603225029.A13363@physics.iisc.ernet.in>

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Rahul Siddharthan wrote:
> 
> man 2 undelete
> 
> Basically, a delete/rm command doesn't physically erase data from the
> disk, it only removes the file entry. The data may still be there if
> you're lucky.  I don't know what the issues are with ufs, however.
> With an msdos filesystem it's pretty straightforward to get the data
> back if that hard disk space hasn't been written over in the meantime.

The problem is that the space your file used to occupy may now be filled
with information that belongs to someone else (who used your space and
then deleted his file).  This doesn't matter in MS-DOS, because that OS
has no concept of file ownership, but it is a significant security hole
in Unix.




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