From owner-freebsd-questions@FreeBSD.ORG  Wed Aug 24 16:52:55 2005
Return-Path: <owner-freebsd-questions@FreeBSD.ORG>
X-Original-To: freebsd-questions@freebsd.org
Delivered-To: freebsd-questions@freebsd.org
Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125])
	by hub.freebsd.org (Postfix) with ESMTP id B0CC416A41F
	for <freebsd-questions@freebsd.org>;
	Wed, 24 Aug 2005 16:52:55 +0000 (GMT)
	(envelope-from keramida@ceid.upatras.gr)
Received: from kane.otenet.gr (kane.otenet.gr [195.170.0.95])
	by mx1.FreeBSD.org (Postfix) with ESMTP id E4B8943D49
	for <freebsd-questions@freebsd.org>;
	Wed, 24 Aug 2005 16:52:54 +0000 (GMT)
	(envelope-from keramida@ceid.upatras.gr)
Received: from orion.daedalusnetworks.priv (aris.bedc.ondsl.gr [62.103.39.226])
	by kane.otenet.gr (8.13.4/8.13.4/Debian-1) with SMTP id j7OGqq8a010081; 
	Wed, 24 Aug 2005 19:52:52 +0300
Received: from orion.daedalusnetworks.priv (orion [127.0.0.1])
	by orion.daedalusnetworks.priv (8.13.4/8.13.4) with ESMTP id
	j7OGqqBq000875; Wed, 24 Aug 2005 19:52:52 +0300 (EEST)
	(envelope-from keramida@ceid.upatras.gr)
Received: (from keramida@localhost)
	by orion.daedalusnetworks.priv (8.13.4/8.13.4/Submit) id j7OGqpFH000874;
	Wed, 24 Aug 2005 19:52:51 +0300 (EEST)
	(envelope-from keramida@ceid.upatras.gr)
X-Authentication-Warning: orion.daedalusnetworks.priv: keramida set sender to
	keramida@ceid.upatras.gr using -f
Date: Wed, 24 Aug 2005 19:52:51 +0300
From: Giorgos Keramidas <keramida@ceid.upatras.gr>
To: antenneX <antennex@swbell.net>
Message-ID: <20050824165251.GA855@orion.daedalusnetworks.priv>
References: <20050824130412.GB877@orion.daedalusnetworks.priv>
	<000801c5a8ca$aca01680$0200000a@SAGEAME>
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <000801c5a8ca$aca01680$0200000a@SAGEAME>
Cc: freebsd-questions@freebsd.org
Subject: Re: Script help using "cut"
X-BeenThere: freebsd-questions@freebsd.org
X-Mailman-Version: 2.1.5
Precedence: list
List-Id: User questions <freebsd-questions.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/listinfo/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: <http://lists.freebsd.org/mailman/listinfo/freebsd-questions>, 
	<mailto:freebsd-questions-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Wed, 24 Aug 2005 16:52:55 -0000

On 2005-08-24 11:41, antenneX <antennex@swbell.net> wrote:
>Giorgos Keramidas <keramida@ceid.upatras.gr> wrote:
>> sed -e 's/)[[:space:]]*$//' -e 's/^.*@//'
>>
>> or you can use as complex regular expressions as necessary to cut
>> specific parts of the line:
>>
>> sed -e 's/^.*@\([^)]*\))[[:space:]]*$/\1/'
>
> In fact, my very next script line uses sed(1) to add the TAB and the
> RHS to the sendmail access file:
> sed 's/$/       REJECT/g' tmpfile >> /etc/mail/access
>
> I'll bet my line could be incorporated with yours.

Sure.  It's probably also a good idea to use mv(1) with a temporary file
residing under /etc/mail too, to make sure the update to the access map
is as close to being an ``atomic operation'' as possible:

% accesstmp=`mktemp /etc/mail/access.tmp.XXXXXX`
% if [ -z "${accesstmp}" ]; then
% 	exit 1
% fi
%
% ( cat /etc/mail/access ;
%   awk '{whatever else here}' tmpfile | \
%   sed -e 's/^.*@\([^)]*\))[[:space:]]*$/\1	REJECT/' ) > "${accesstmp}"
% if [ $? -ne 0 ]; then
% 	exit 1
% fi
% mv "${accesstmp}" /etc/mail/access
% cd /etc/mail && make access.db