From owner-freebsd-questions  Sat Oct  6 12:57: 9 2001
Delivered-To: freebsd-questions@freebsd.org
Received: from kabel203069.kabel.utwente.nl (kabel203069.kabel.utwente.nl [130.89.203.69])
	by hub.freebsd.org (Postfix) with ESMTP id B250037B401
	for <freebsd-questions@FreeBSD.ORG>; Sat,  6 Oct 2001 12:57:05 -0700 (PDT)
Received: by kabel203069.kabel.utwente.nl (Postfix, from userid 1000)
	id 1A20813670; Sat,  6 Oct 2001 21:57:04 +0200 (CEST)
Date: Sat, 6 Oct 2001 21:57:03 +0200
From: Rogier Steehouder <r.j.s@gmx.net>
To: cyu0635@home.com
Cc: "freebsd-questions@FreeBSD.ORG" <freebsd-questions@FreeBSD.ORG>
Subject: Re: [FBSD-Q] script question
Message-ID: <20011006215703.A468@localhost>
Mail-Followup-To: Rogier Steehouder <r.j.s@gmx.net>,
	cyu0635@home.com,
	"freebsd-questions@FreeBSD.ORG" <freebsd-questions@FreeBSD.ORG>
References: <3BBF1F7D.3218276B@home.com>
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
User-Agent: Mutt/1.2.5i
In-Reply-To: <3BBF1F7D.3218276B@home.com>; from cyu0635@home.com on Sat, Oct 06, 2001 at 11:13:02AM -0400
Sender: owner-freebsd-questions@FreeBSD.ORG
Precedence: bulk
List-ID: <freebsd-questions.FreeBSD.ORG>
List-Archive: <http://docs.freebsd.org/mail/> (Web Archive)
List-Help: <mailto:majordomo@FreeBSD.ORG?subject=help> (List Instructions)
List-Subscribe: <mailto:majordomo@FreeBSD.ORG?subject=subscribe%20freebsd-questions>
List-Unsubscribe: <mailto:majordomo@FreeBSD.ORG?subject=unsubscribe%20freebsd-questions>
X-Loop: FreeBSD.ORG

On 06-10-2001 11:13 (-0400), cyu0635@home.com wrote:
> Hi all
> 
> I use the following script to mail to log file
> but sometimes I got the workings 'Null message, hope that ok' after
> running the script
> 
> Why?
> and what is wrong?
> 
> TIA
> 
> #! /bin/bash
> /bin/cat /var/log/messages    > /tmp/tmp_logs
> /bin/cat /var/log/secure    >>  /tmp/tmp_logs
> /bin/cat /tmp/tmp_logs | grep "$(date +"%b %d" | sed 's/ 0/ /g')" | sort
> -o /tmp
> /yesterday_log +2
> /bin/cat /tmp/yesterday_log | mail -s "Yesterday's Logged Events"
> peter@localhos
> t

Suppose your logs rotated this morning, then tmp_logs will not contain
any entries for yesterday, so yesterday_log will be empty and you're
sending an empty mail message. You could adapt this script to include
the latest backup log in tmp_logs using zcat, but even then it would not
be completely full proof (what if yesterdays log entries span several
backups?).

With kind regards, Rogier Steehouder

-- 
                          ___                          _
-O_\                                                  //
 | /               Rogier Steehouder                 //\
/ \                  r.j.s@gmx.net                  //  \
  <---------------------- 25m ---------------------->

To Unsubscribe: send mail to majordomo@FreeBSD.org
with "unsubscribe freebsd-questions" in the body of the message