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From: todd@uhccux.UUCP (The Perplexed Wiz)
Newsgroups: comp.unix.wizards
Subject: Re: rm with a block scrub
Message-ID: <500@uhccux.UUCP>
Date: Thu, 21-May-87 17:48:04 EDT
Article-I.D.: uhccux.500
Posted: Thu May 21 17:48:04 1987
Date-Received: Sat, 23-May-87 13:10:29 EDT
References: <7421@brl-adm.ARPA> <6899@alice.UUCP> <520@unisec.usi.com>
Reply-To: todd@uhccux.UUCP (The Perplexed Wiz)
Organization: U. of Hawaii, Manoa (Honolulu)
Lines: 19

In article <6899@alice.UUCP> ark@alice.UUCP writes:
>>In article <7421@brl-adm.ARPA>, evins@nrl-radar.arpa writes:
>> Does anyone know of a version of rm that allows you to scrub blocks
>> clean before making them available, for BSD VAXes and Suns.
>Before you unlink the file, open it for output and write a block
>of zeroes over every block of the file.  Then sync() and unlink it.

I don't have to deal with such issues as scrubbing disks for security
anymore.  But back when I did, I seem to recall that gov't sites had
a few rules as to exactly what was considered a clean disk for
security purposes.  You might want to check with your organization's
security people before you start spending time writing file scrubbing
code....todd

-- 
Todd Ogasawara, U. of Hawaii Computing Center
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