From owner-freebsd-questions@FreeBSD.ORG  Sat Mar  3 09:56:19 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 819DD16A400
	for <freebsd-questions@freebsd.org>;
	Sat,  3 Mar 2007 09:56:19 +0000 (UTC)
	(envelope-from mplekos@physics.upatras.gr)
Received: from nic.upatras.gr (nic.upatras.gr [150.140.129.30])
	by mx1.freebsd.org (Postfix) with SMTP id AF1B313C441
	for <freebsd-questions@freebsd.org>;
	Sat,  3 Mar 2007 09:56:18 +0000 (UTC)
	(envelope-from mplekos@physics.upatras.gr)
Received: (qmail 4447 invoked by uid 111); 3 Mar 2007 09:29:35 -0000
Received: from 150.140.159.71 by nic.upatras.gr (envelope-from
	<mplekos@physics.upatras.gr>, uid 103) with qmail-scanner-1.25 
	(clamdscan: 0.83/706.  Clear:RC:1(150.140.159.71):. 
	Processed in 0.073681 secs); 03 Mar 2007 09:29:35 -0000
Received: from pythagoras.physics.upatras.gr (150.140.159.71)
	by nic.upatras.gr with SMTP; 3 Mar 2007 09:29:35 -0000
Received: (qmail 26790 invoked by uid 1111); 3 Mar 2007 09:26:47 -0000
Date: Sat, 3 Mar 2007 11:26:47 +0200
From: Kostas Blekos <mplekos@physics.upatras.gr>
To: Robert Davison <rob_27_preston@yahoo.co.uk>
Message-ID: <20070303092646.GA26572@pythagoras.physics.upatras.gr>
Mail-Followup-To: Robert Davison <rob_27_preston@yahoo.co.uk>,
	freebsd-questions@freebsd.org
References: <285897.32858.qm@web25012.mail.ukl.yahoo.com>
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <285897.32858.qm@web25012.mail.ukl.yahoo.com>
User-Agent: Mutt/1.4.2.2i
Cc: freebsd-questions@freebsd.org
Subject: Re: Backup Script
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: Sat, 03 Mar 2007 09:56:19 -0000

Robert Davison <rob_27_preston@yahoo.co.uk> on Sat, Mar 03, 2007 (09:06 +0000) wrote:
> Im trying to write a small backup script which I have put in
> /etc/periodic/weekly. The script is as follows......
>    
>   #!/bin/sh
> #
> #weekly backup of chosen files
> #
> if
> then
>         tar -cf /dev/sa0 /var/ftp /home /etc /usr/local
>         echo "backing up the disks"
> else
>         echo "There was a problem" 1>&2
>         exit 1
> fi
>   echo "Finished at `/bin/date`."
> exit
> 
>    
>   Now I have no experience at bash scripting as was wonderng if
>   someone could give me some help with the if statement. Basically im
>   trying to test to see if the machine knows that /dev/sa0 (my tape
>   drive) is accessable. If it is then it continus to the backup, if
>   not then it gives the error message and echos the date.
>    
>   Any help would be much appreciated.
> 
> 
>  		

 You can test if it is writable by:
[ -w /dev/sa0 ]
 eg:
-----------
if [ -w /dev/sa0 ]
then
	echo "Writable"
else
	echo "Not writable"
fi
-----------
"man test" for other tests.

-- 
Kostas Blekos	<http://a.physics.upatras.gr/~mplekos/>
GPGKey = 1398 1AB3 483E B2DF 3A2D  95F4 7534 E392 012E 6167