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Date: Tue, 5 Jun 2012 16:58:08 -0700
From: Andrew Morton <akpm@linux-foundation.org>
To: Joe Perches <joe@perches.com>
Cc: Kay Sievers <kay@vrfy.org>, Linus Torvalds <torvalds@linux-foundation.org>,
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Subject: Re: [PATCH 0/8] Rework KERN_<LEVEL>
Message-Id: <20120605165808.cd255b93.akpm@linux-foundation.org>
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On Tue, 05 Jun 2012 16:52:25 -0700
Joe Perches <joe@perches.com> wrote:

> On Wed, 2012-06-06 at 01:48 +0200, Kay Sievers wrote:
> > On Wed, Jun 6, 2012 at 1:43 AM, Joe Perches <joe@perches.com> wrote:
> > > On Wed, 2012-06-06 at 01:39 +0200, Kay Sievers wrote:
> > 
> > >> > # echo "\001Hello Andrew" > /dev/kmsg
> > >> > /dev/kmsg has
> > >> > 12,774,2462339252;\001Hello Andrew
> > >>
> > >> Try "echo -e"? The stuff is copied verbatim otherwise.
> > >
> > > # echo -e "\001Hello Kay" > /dev/kmsg
> > > gives
> > > 12,776,3046752764;\x01Hello Kay
> > 
> > Don't you need two bytes to trigger the logic?
> 
> Yes.  Angle brackets fore and aft.

he means

	echo "\0014Hello Joe" > /dev/kmsg
	          ^

It needs one of [0-7cd] to trigger the prefix handling.
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