svn commit: r265132 - in head: share/man/man4 sys/dev/null
mdf at FreeBSD.org
Wed Apr 30 16:02:23 UTC 2014
On Wed, Apr 30, 2014 at 7:48 AM, Ian Lepore <ian at freebsd.org> wrote:
> On Wed, 2014-04-30 at 06:20 +0000, Eitan Adler wrote:
>> Author: eadler
>> Date: Wed Apr 30 06:20:48 2014
>> New Revision: 265132
>> URL: http://svnweb.freebsd.org/changeset/base/265132
>> Add a /dev/full device.
>> /dev/full is similar to /dev/zero except it always returns
>> ENOSPC when you attempt to write to it.
> For some reason this reminded me of something I've been wanting for a
> while but never get around to writing... /dev/ones, it's just
> like /dev/zero except it returns 0xff bytes. Useful for dd'ing to wipe
> out flash-based media.
dd if=/dev/zero | tr "\000" "\377" | dd of=<xxx>
But it's not quite the same.
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