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Date:	Wed, 28 Nov 2001 08:07:15 +0100
From:	Corinna Vinschen <cygwin AT cygwin DOT com>
To:	cygwin AT cygwin DOT com
Subject:	Re: Shell process identification
Message-ID:	<20011128080715.U14975@cygbert.vinschen.de>
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References:	<006501c1779a$8252add0$2701010a AT crosstrust DOT com>
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In-Reply-To:	<006501c1779a$8252add0$2701010a@crosstrust.com>; from dmeier@crosstrust.com on Tue, Nov 27, 2001 at 03:23:21PM -0800

On Tue, Nov 27, 2001 at 03:23:21PM -0800, Daniel Meier wrote:
> I want to cron/at a bash script but have it check to see if another instance of the script is already running.
> 
> I did a ps -Wl and a ps -ef while I had the script running and while I saw the /usr/bin/bash executables (my current shell and the shell I wanted to detect) they did not contain enough information to differentiate between the two shells.
> 
> Any ideas of how I can determine this? I thought of using a temp file, but if the script terminates abnormally it might not cleanup it's files, causing the next cron job to not run, thinking that the other script is still running.

A temp file /var/run/<yourTask>.pid containing the PID of the process
should give the information you need.

Corinna

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Corinna Vinschen                  Please, send mails regarding Cygwin to
Cygwin Developer                                mailto:cygwin AT cygwin DOT com
Red Hat, Inc.

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