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Shell Programming and Scripting
Script that checks for previous instances running
Post 302120796 by bd_joy on Friday 8th of June 2007 08:35:27 AM
06-08-2007
Script that checks for previous instances running
Hello,
I'm trying to write a script that checks for previous instances of the same script which may still be running (this script is scheduled to run every 30 minutes). I want to somehow use the pid from each instance to make sure the previous one isn't running before continuing with my processing, and wait for a set time period before checking again. I'd also like it to only retry a certain number of times before exiting with a failure notification.
I've never used a scripts pid before but one of my unix admins said that I can get the pid of the process by running a "echo $$" within the script.
Any suggestions to be appreciated. Right now I just have an e-mail notification at the end of my script with a date stamp so I can see (every 30 minutes thru the business day) that the script finished before the next one was scheduled to start - which is far from idea.
EDIT: I should note that this runs on AIX 5.3 and using ksh.
I'm trying to write a script that checks for previous instances of the same script which may still be running (this script is scheduled to run every 30 minutes). I want to somehow use the pid from each instance to make sure the previous one isn't running before continuing with my processing, and wait for a set time period before checking again. I'd also like it to only retry a certain number of times before exiting with a failure notification.
I've never used a scripts pid before but one of my unix admins said that I can get the pid of the process by running a "echo $$" within the script.
Any suggestions to be appreciated. Right now I just have an e-mail notification at the end of my script with a date stamp so I can see (every 30 minutes thru the business day) that the script finished before the next one was scheduled to start - which is far from idea.
EDIT: I should note that this runs on AIX 5.3 and using ksh.
Last edited by bd_joy; 06-08-2007 at 09:49 AM.. Reason: Additional Info
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LEARN ABOUT OSF1
uudemon
uudemon(4) Kernel Interfaces Manual uudemon(4) NAME
uudemon.admin, uudemon.cleanu, uudemon.hour, uudemon.poll - Administrative shell scripts for polling remote systems, cleaning up spool directories, reporting status to the system administrator, and routine invocations of the uuxqt and uusched daemons SYNOPSIS
These shell scripts reside in the following directory: /usr/lib/uucp DESCRIPTION
All the scripts can be run from the command line or can be run automatically by the cron daemon. To automatically run the scripts, remove the comment character (#) from the beginning of the relevant line in the /var/spool/cron/crontabs/uucp file. This script reports status to the system administrator. It issues the uustat command to find out the status of uucp jobs. It mails the results to the uucp login ID. The script may be modified to send mail to any login ID such as the uucp administrative login ID (uucpa) or root. This script cleans up the /var/spool/uucp and /var/spool/uucppublic directories by running the uucleanup command. The uucleanup com- mand is run with the following parameters: -C7, -D7, X2, -o2, -W1. This script runs the uusched and uuxqt daemons in the background. This script polls the systems listed in the /usr/lib/uucp/Poll file. The uudemon.poll script should be scheduled before the uudemon.hour script. This allows uudemon.poll to create any command files before cron runs the uudemon.hour script. FILES
Contains the uudemon.admin, uudemon.cleanu, uudemon.hour and uudemon.poll files. Contains the uucp file. RELATED INFORMATION
Commands: cron(8), uucleanup(8), uusched(8), uuxqt(1) Files: /usr/lib/uucp delim off uudemon(4)