From owner-freebsd-questions@FreeBSD.ORG  Tue Jan  4 10:32:01 2011
Return-Path: <owner-freebsd-questions@FreeBSD.ORG>
Delivered-To: freebsd-questions@freebsd.org
Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34])
	by hub.freebsd.org (Postfix) with ESMTP id 632BD106564A
	for <freebsd-questions@freebsd.org>;
	Tue,  4 Jan 2011 10:32:01 +0000 (UTC)
	(envelope-from smathias1972@yahoo.com)
Received: from web121409.mail.ne1.yahoo.com (web121409.mail.ne1.yahoo.com
	[98.138.90.103]) by mx1.freebsd.org (Postfix) with SMTP id E5CA68FC16
	for <freebsd-questions@freebsd.org>;
	Tue,  4 Jan 2011 10:32:00 +0000 (UTC)
Received: (qmail 42854 invoked by uid 60001); 4 Jan 2011 10:32:00 -0000
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=yahoo.com; s=s1024;
	t=1294137120; bh=Vc+WT4A94zn4GUMXm2PWm2MzBqqiJg7UJbcjWLKdnKA=;
	h=Message-ID:X-YMail-OSG:Received:X-Mailer:Date:From:Subject:To:MIME-Version:Content-Type;
	b=neFo84DBWOJjCMgoEsq9akMyu3bxAPYqlnsKVYiYyd8fdsdU4kX9mfgVn17euJLOJKfqjIT72tp6YraAWP4FhZvY1eBP7/mgosrrgTtjxr0p75jOrM/mAOo3424MQ7Cjkpu6xmFNdRdDAGQ158tPvy0oXQwbhwn5xOnDJRaDUDg=
DomainKey-Signature: a=rsa-sha1; q=dns; c=nofws; s=s1024; d=yahoo.com;
	h=Message-ID:X-YMail-OSG:Received:X-Mailer:Date:From:Subject:To:MIME-Version:Content-Type;
	b=oWuLnC7VWe0Fyf/Zn8abAFmSK4peNVHMQVNINtKOBrDkfaamE2yeQTkvaZHrGq14o1faxgDcm22+F0wtfEZ4gBq1Aty6hEH7WSt4vUIaoAqcxzozYwcmgewsFoyDbEwBftsFiJru9uGu9xIAoR/gBXC63HAdhRxb673xPFGgvPQ=;
Message-ID: <117654.42578.qm@web121409.mail.ne1.yahoo.com>
X-YMail-OSG: 24Nk.gAVM1n5MXTTFZsV18rnBDLKd8pdQfK4lRb1yo6uVsY
	50glTw2B7llrhaqxafbu0wdrZyiaE.I9gYHeJyUyv7_LHejrHnYdvP_5iyHj
	wfh5a3Dbgntyq0dJ2gHVLgJJTJwiFu6iuaR37N4EYF3146rjOzqCPjCOLeBS
	0LqlZrrYP4Fg7dRy7QKNIS0e_fvCf8x6MmoP1DA--
Received: from [94.21.195.28] by web121409.mail.ne1.yahoo.com via HTTP;
	Tue, 04 Jan 2011 02:32:00 PST
X-Mailer: YahooMailClassic/11.4.20 YahooMailWebService/0.8.107.285259
Date: Tue, 4 Jan 2011 02:32:00 -0800 (PST)
From: S Mathias <smathias1972@yahoo.com>
To: freebsd-questions@freebsd.org
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
X-Mailman-Approved-At: Tue, 04 Jan 2011 12:17:43 +0000
Subject: a perl question
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: Tue, 04 Jan 2011 10:32:01 -0000

cat asdf.txt
bla-bla
bla-bla
bla[XYZ]
importantthing
another important thing
[/XYZ]
bla-bla
bla-bla
[XYZ]
yet another thing
hello!
[/XYZ]
bla-bla
etc.
$ SOMEPERLMAGIC asdf.txt > output.txt
$ cat output.txt
importantthing
another important thing
yet another thing
hello!


how can i sovle this question? what is SOMEPERLMAGIC? are there any perl gurus, that have a little spare time?

Thank you! :\