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Hazardous Duplicate Cron Entry?

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Operating Systems HP-UX Hazardous Duplicate Cron Entry?
# 1  
Old 07-13-2005
Hazardous Duplicate Cron Entry?
Hi All,
How to prevent starting of processes that have duplicate entries in cron file, i have written a shell script to validate with "ps |grep" command before starting the process, but still when same process started at same time, it may not be able to detect the existing process.

Sample cron Entry

00 10 * * * /usr/nag/startInterestCalculationBatch
00 10 * * * /usr/nag/startInterestCalculationBatch

startInterestCalculationBatch file willl validate with "ps |grep" command before starting the InterestCalculation (Java) process
Is there any other options? to prevent it.

Regards

Nag
Last edited by nag_sundaram; 07-13-2005 at 08:35 AM..
# 2  
Old 07-13-2005
You could easily look for a temporary file and if it doesn't exist, create it at the start of the cron job. This would then be your control file which doesn't allow other cron jobs to run (each cron job would look for the file, if it exists, exit).
# 3  
Old 07-13-2005
It is probably also worth looking at the root cause of this and establishing why there are duplicate jobs in the crontab in the first place (and who is putting them there) - and then delete them!

Cheers
ZB
# 4  
Old 07-14-2005
Bug
I do agree with ZB. try to find duplicate entries in cron and remove the same.
You can do it manually if crontab files for users are not big or else simply by using sort -u option.
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