Research ID - in Crontab Post: 302821837

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Top Forums UNIX for Advanced & Expert Users Research ID - in Crontab Post 302821837 by bakunin on Saturday 15th of June 2013 05:03:41 PM

06-15-2013

Registered User

There are two different aspects here: finding out who had run the script and making sure no two instances of the script run simultaneously.

The first is probably impossible. I don't know of any Informatica log file which would tell you this and you probably have not system auditing turned on and configured appropriately to find it in the systems audit logs. You might consider configuring system auditing in the future if you are interested in such information.

Regarding the second problem: this is relatively easy. Change the script so that when it starts it writes a "PID-file". Classically these PID-files are stored in /var/run, are named like the command/process they belong to and contain the PID of the running job. The first thing this script should do is to check if such a PID-file exists. If it does, it aborts with some error, otherwise it creates the PID-file, does whatever it is supposed to do and deletes the PID-file upon exit. Here is a sketch for this:

Code:

#! /bin/ksh

typeset    chProgName="$(basename $0)"
typeset -i iPID=$$

trap { \
     rm -f /var/run/${chProgName}.pid \
     } 0

if [ ! -r /var/run/${chProgName}.pid ] ; then
     print - $iPID > /var/run/${chProgName}.pid
else
     error_exit "Cannot proceed, another instance runs already"
fi

... normal code begins here ...

exit

I hope this helps.

bakunin

bakunin

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cron

CRON(8) 						      System Manager's Manual							   CRON(8)

NAME

       cron - daemon to execute scheduled commands (Vixie Cron)

SYNOPSIS

       cron

DESCRIPTION

       Cron should be started from /etc/rc or /etc/rc.local.  It will return immediately, so you don't need to start it with '&'.

       Cron searches /var/spool/cron for crontab files which are named after accounts in /etc/passwd; crontabs found are loaded into memory.  Cron
       also searches for /etc/crontab and the files in the /etc/cron.d/ directory, which are in a different format (see  crontab(5)).	Cron  then
       wakes up every minute, examining all stored crontabs, checking each command to see if it should be run in the current minute.  When execut-
       ing commands, any output is mailed to the owner of the crontab (or to the user named in the MAILTO environment variable in the crontab,	if
       such exists).

       Additionally,  cron checks each minute to see if its spool directory's modtime (or the modtime on /etc/crontab) has changed, and if it has,
       cron will then examine the modtime on all crontabs and reload those which have changed.	Thus cron need not be restarted whenever a crontab
       file is modified.  Note that the Crontab(1) command updates the modtime of the spool directory whenever it changes a crontab.

SEE ALSO

       crontab(1), crontab(5)

AUTHOR

       Paul Vixie <paul@vix.com>

4th Berkeley Distribution					 20 December 1993							   CRON(8)