Script that checks for previous instances running Post: 302121386

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Top Forums Shell Programming and Scripting Script that checks for previous instances running Post 302121386 by bd_joy on Wednesday 13th of June 2007 02:23:47 PM

06-13-2007

Registered User

Quote:

Originally Posted by jim mcnamara

I'm confused - you wanted a pid, I thought.

Instead of telling us how you want to do it, like find a pid, how about file existence?

Code:

#!/bin/ksh
if [[ ! -f /tmp/myscript.sh.lock ]] ; then  # is file not there 
    echo "1" >  /tmp/myscript.sh.lock   # no, make one and proceeed with script
else
    echo "Another myscript still running."  # exit, file is still there
    exit 1
fi
# ............. do stuff
rm -f /tmp/myscript.sh.lock     # remove the file so the next gut can run
exit 0

I do not see why an approach like this will not work. It does have issues if your script fails a lot or if you reboot during the time the script is running. But. You can easily add an ignore option, myscript.sh -I, so that it runs regardless of the exitence of the file.

Thank you for your input. This is what I think I'm going to do. I can't get the counter to work right, but I'll keep messing with it.

#!/bin/sh
EMAIL1="djoy3@nomail.com"
count=0
until ls myscript2.sh.trg >>/dev/null 2>&1
do
count=count+1
if [ count -gt 16 ]
then
echo "Max wait time exceeded for myscript2.sh job" | mailx -s "myscript2.sh job error - `date`" ${EMAIL1}
exit 1
fi
sleep 20
done
#do other processing here
echo "Other processing running"
touch myscript2.sh.trg

bd_joy

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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)