From owner-freebsd-questions@freebsd.org  Fri Nov  1 04:44:31 2019
Return-Path: <owner-freebsd-questions@freebsd.org>
Delivered-To: freebsd-questions@mailman.nyi.freebsd.org
Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1])
 by mailman.nyi.freebsd.org (Postfix) with ESMTP id 76D8B1A4284
 for <freebsd-questions@mailman.nyi.freebsd.org>;
 Fri,  1 Nov 2019 04:44:31 +0000 (UTC) (envelope-from kh@panix.com)
Received: from mailbackend.panix.com (mailbackend.panix.com [166.84.1.89])
 (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits))
 (Client did not present a certificate)
 by mx1.freebsd.org (Postfix) with ESMTPS id 4748jp6mYlz4HYw
 for <freebsd-questions@freebsd.org>; Fri,  1 Nov 2019 04:44:30 +0000 (UTC)
 (envelope-from kh@panix.com)
Received: from rain.home (pool-72-74-69-77.bstnma.fios.verizon.net
 [72.74.69.77])
 by mailbackend.panix.com (Postfix) with ESMTPSA id 4748jn6F7yzygG
 for <freebsd-questions@freebsd.org>; Fri,  1 Nov 2019 00:44:29 -0400 (EDT)
Subject: Re: grep for ascii nul
To: freebsd-questions@freebsd.org
References: <20191101024817.GA60134@admin.sibptus.ru>
From: Kurt Hackenberg <kh@panix.com>
Message-ID: <558fd145-ad3e-90dc-5930-c01ca0c27d3c@panix.com>
Date: Fri, 1 Nov 2019 00:44:23 -0400
User-Agent: Mozilla/5.0 (X11; FreeBSD amd64; rv:68.0) Gecko/20100101
 Thunderbird/68.1.2
MIME-Version: 1.0
In-Reply-To: <20191101024817.GA60134@admin.sibptus.ru>
Content-Language: en-US
X-Rspamd-Queue-Id: 4748jp6mYlz4HYw
X-Spamd-Bar: ---
Authentication-Results: mx1.freebsd.org; dkim=none; dmarc=none;
 spf=pass (mx1.freebsd.org: domain of kh@panix.com designates 166.84.1.89 as
 permitted sender) smtp.mailfrom=kh@panix.com
X-Spamd-Result: default: False [-3.79 / 15.00]; ARC_NA(0.00)[];
 RCVD_VIA_SMTP_AUTH(0.00)[]; NEURAL_HAM_MEDIUM(-1.00)[-0.998,0];
 FROM_HAS_DN(0.00)[]; R_SPF_ALLOW(-0.20)[+ip4:166.84.0.0/16];
 TO_MATCH_ENVRCPT_ALL(0.00)[]; HAS_ATTACHMENT(0.00)[];
 MIME_GOOD(-0.10)[multipart/mixed,text/plain];
 PREVIOUSLY_DELIVERED(0.00)[freebsd-questions@freebsd.org];
 MIME_BAD_ATTACHMENT(1.60)[c]; RCPT_COUNT_ONE(0.00)[1];
 NEURAL_HAM_LONG(-1.00)[-1.000,0]; TO_DN_NONE(0.00)[];
 RCVD_IN_DNSWL_MED(-0.20)[89.1.84.166.list.dnswl.org : 127.0.5.2];
 DMARC_NA(0.00)[panix.com];
 IP_SCORE(-2.89)[ip: (-8.73), ipnet: 166.84.0.0/16(-3.15), asn: 2033(-2.52),
 country: US(-0.05)]; FROM_EQ_ENVFROM(0.00)[];
 R_DKIM_NA(0.00)[]; MIME_TRACE(0.00)[0:+,1:+,2:~];
 ASN(0.00)[asn:2033, ipnet:166.84.0.0/16, country:US];
 MID_RHS_MATCH_FROM(0.00)[]; RCVD_TLS_ALL(0.00)[];
 RCVD_COUNT_TWO(0.00)[2]
Content-Type: text/plain; charset=windows-1252; format=flowed
Content-Transfer-Encoding: 7bit
X-Content-Filtered-By: Mailman/MimeDel 2.1.29
X-BeenThere: freebsd-questions@freebsd.org
X-Mailman-Version: 2.1.29
Precedence: list
List-Id: User questions <freebsd-questions.freebsd.org>
List-Unsubscribe: <https://lists.freebsd.org/mailman/options/freebsd-questions>, 
 <mailto:freebsd-questions-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-questions/>
List-Post: <mailto:freebsd-questions@freebsd.org>
List-Help: <mailto:freebsd-questions-request@freebsd.org?subject=help>
List-Subscribe: <https://lists.freebsd.org/mailman/listinfo/freebsd-questions>, 
 <mailto:freebsd-questions-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Fri, 01 Nov 2019 04:44:31 -0000

On 2019-10-31 22:48, Victor Sudakov wrote:

> How can I print the names of files containing ascii nul (\x0)? The
> FreeBSD "grep -l" does not seem to be able to do it.

Yeah, no. Probably grep takes that NUL as the end of the C string that 
is that command-line argument.

You could use the attached program, which I wrote some time ago for this 
purpose.