From owner-freebsd-questions@FreeBSD.ORG  Fri Jan  7 16:43:36 2005
Return-Path: <owner-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 799E416A4CE
	for <questions@freebsd.org>; Fri,  7 Jan 2005 16:43:36 +0000 (GMT)
Received: from aiolos.otenet.gr (aiolos.otenet.gr [195.170.0.23])
	by mx1.FreeBSD.org (Postfix) with ESMTP id 2CD8F43D2F
	for <questions@freebsd.org>; Fri,  7 Jan 2005 16:43:35 +0000 (GMT)
	(envelope-from keramida@ceid.upatras.gr)
Received: from orion.daedalusnetworks.priv (aris.bedc.ondsl.gr
	[62.103.39.226])j07GhWow013512;	Fri, 7 Jan 2005 18:43:33 +0200
Received: from orion.daedalusnetworks.priv (orion [127.0.0.1])
	j07GhWkj002301;	Fri, 7 Jan 2005 18:43:32 +0200 (EET)
	(envelope-from keramida@ceid.upatras.gr)
Received: (from keramida@localhost)j07GhWFH002300;
	Fri, 7 Jan 2005 18:43:32 +0200 (EET)
	(envelope-from keramida@ceid.upatras.gr)
Date: Fri, 7 Jan 2005 18:43:32 +0200
From: Giorgos Keramidas <keramida@ceid.upatras.gr>
To: Tom Vilot <tom@vilot.com>
Message-ID: <20050107164332.GB2249@orion.daedalusnetworks.priv>
References: <41DEBA93.8060909@vilot.com>
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <41DEBA93.8060909@vilot.com>
cc: questions@freebsd.org
Subject: Re: my lame attempt at a shell script...
X-BeenThere: freebsd-questions@freebsd.org
X-Mailman-Version: 2.1.1
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: Fri, 07 Jan 2005 16:43:36 -0000

On 2005-01-07 09:36, Tom Vilot <tom@vilot.com> wrote:
>Eric F Crist wrote:
>> What is the point of the { } around some variables?
>
> It's not strictly necessary, except in some cases. i.e:
>
> m=34
> echo $m
>
> You don't need it there.

> But you would want it here:
>
> f=/var/filename
> fname=${f//name/name2}

Or when characters adjacent to the variable name may be difficult to
separate from the name itself:

	disk="ad0"
	slice="${disk}s1"
	partition="${slice}a"
	#
	echo "${disk} ${partition} ${slice}"

- Giorgos