From owner-freebsd-questions@FreeBSD.ORG  Sun Apr 15 16:52:52 2007
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 [69.147.83.52])
	by hub.freebsd.org (Postfix) with ESMTP id 933FA16A403
	for <freebsd-questions@freebsd.org>;
	Sun, 15 Apr 2007 16:52:52 +0000 (UTC) (envelope-from parv@pair.com)
Received: from mta9.adelphia.net (mta9.adelphia.net [68.168.78.199])
	by mx1.freebsd.org (Postfix) with ESMTP id 50BA013C4AE
	for <freebsd-questions@freebsd.org>;
	Sun, 15 Apr 2007 16:52:52 +0000 (UTC) (envelope-from parv@pair.com)
Received: from default.chvlva.adelphia.net ([24.126.17.68])
	by mta9.adelphia.net
	(InterMail vM.6.01.05.02 201-2131-123-102-20050715) with ESMTP id
	<20070415165251.DQJU14403.mta9.adelphia.net@default.chvlva.adelphia.net>;
	Sun, 15 Apr 2007 12:52:51 -0400
Received: by default.chvlva.adelphia.net (Postfix, from userid 1000)
	id 3715DB60A; Sun, 15 Apr 2007 12:53:09 -0400 (EDT)
Date: Sun, 15 Apr 2007 12:53:09 -0400
From: Parv <parv@pair.com>
To: Zhang Weiwu <zhangweiwu@realss.com>
Message-ID: <20070415165309.GA1175@holestein.holy.cow>
Mail-Followup-To: Zhang Weiwu <zhangweiwu@realss.com>,
	f-q <freebsd-questions@freebsd.org>
References: <1176603461.20274.12.camel@joe.realss.com>
	<20070415054023.GA6596@holestein.holy.cow>
	<1176625617.22011.16.camel@joe.realss.com>
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <1176625617.22011.16.camel@joe.realss.com>
Cc: f-q <freebsd-questions@freebsd.org>
Subject: Re: [OT] can sed handle this situation? (might require variable)
X-BeenThere: freebsd-questions@freebsd.org
X-Mailman-Version: 2.1.5
Precedence: list
Reply-To: f-q <freebsd-questions@freebsd.org>
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: Sun, 15 Apr 2007 16:52:52 -0000

in message <1176625617.22011.16.camel@joe.realss.com>,
wrote Zhang Weiwu thusly...
>
> On Sun, 2007-04-15 at 01:40 -0400, Parv wrote:
> > in message <1176603461.20274.12.camel@joe.realss.com>,
> > wrote Zhang Weiwu thusly...
...
> > > I've got a situation that looks like require using variable
> > > and not possible to process with sed. But I am not sure. Can
> > > someone suggest me if this task is out of scope of sed?
> >
> > Try some variation of what Garret suggested if sed is the
> > requirement and skip rest of the message.
>
> Thank you very much for all of you providing insights. I have not
> yet tried all possibilities in sed but I have just discovered it's
> relatively easy to handle this task in awk with this script:
>
> /^$/ { print "createTimestamp:", timeStamp; timeStamp = ""; }

This prints a "createTimestamp:" line on its own block for every 2
consecutive empty lines (in context of the whole program).


> /^ahkCreateTimeStamp:/ { timeStamp = $2;}
> /^createTimestamp:/ { if (timeStamp == "") timeStamp = $2; }
>
> $0 !~ /^ahkCreateTimeStamp:/ && $0 !~ /^createTimestamp:/ {
> 	print;
> }

Interesting, your description of the solution (sadly not in the
quoted reply) allowed for "createTimestamp" move to
"ahkCreateTimeStamp" line, but implementation above keeps the
"createTimestamp" at its place.  So I suppose order does not
matter(?).


  - Parv

--