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From: Artem Ignatiev <zazubrik@mail.ru>
Date: Sun, 17 Jul 2005 16:56:07 +0400
To: nj18 <nj18@nerdshack.com>
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Cc: FreeBSD Current <freebsd-current@freebsd.org>
Subject: Re: Strange message: Text file busy
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On 15.07.2005, at 0:46, nj18 wrote:

> I guess it's a problem about "echo". I am going to compare
>    /usr/src/bin/echo/echo.c in FreeBSD 5.4. and FreeBSD 4.6.

You may wish to consider tcsh/sh sources, since echo is builtin  
command in most shells.
Or try using /bin/echo instead of just echo.