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Top Forums UNIX for Dummies Questions & Answers how to detect my script is already running Post 96476 by DogDay on Friday 20th of January 2006 08:53:28 AM
Old 01-20-2006
Quote:
Originally Posted by rmulchandani
I have a script which must not be run more than once at any given time. THis script will be scheduled to run every 20 mins as a cron job.

In my script can i have logic to say if this script is already running from the previous cron, then exit.

How do i go about doing that. If you describe the approach, can you please specify just the commands, which i can man to construct my approach.
Because I am not familiar with unix commands, if you tell me "find the file and do stuff..." i may not know the command to "find the file".

thanks!
write a tmp file to the /tmp directory.
have your script check to see if the file exists, if it does then don't run.


#!/bin/sh

# our tmpfile
tmpfile="/tmp/mytmpfile"

# check to see if it exists.
# if it does then exit script
if [[ -f ${tmpfile} ]]; then
echo script already running.
exit
fi

# it doesn't exist at this point so lets make one
touch ${tmpfile}

# do whatever now.

# end of script
rm ${tmpfile}
 

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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)
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