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..
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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)