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Full Discussion: need help in crontab
Top Forums Shell Programming and Scripting need help in crontab Post 302246127 by Annihilannic on Monday 13th of October 2008 01:05:07 AM
Old 10-13-2008
Unfortunately cron isn't very flexible in that respect. Does your script need to run exactly every 15 days, or could you just run it on the 1st and 16th of every month, i.e. approximately every 15 days?

Otherwise you might have to just run the job every day, and add some logic so that it exits without doing anything if the current number of days since Jan 1, 1970 is not evenly divisible by 15:

Code:
days_since_epoch=$(perl -e 'print int(time/86400)"\n";')

if [[ "$(( $days_since_epoch % 15 ))" -ne 0 ]]
then
    exit
else
    # do your stuff
fi


Last edited by Annihilannic; 10-13-2008 at 02:19 AM.. Reason: Removed duplicate calculation of modulus.
 

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CALENDARSERVER_PURGE_EVENTS(8)				    BSD System Manager's Manual 			    CALENDARSERVER_PURGE_EVENTS(8)

NAME
calendarserver_purge_events -- Darwin Calendar Server event clean-up utility SYNOPSIS
calendarserver_purge_events [--config file] [--days number] [--dry-run] [--verbose] [--help] DESCRIPTION
calendarserver_purge_events is a tool for removing old events from the calendar server. By default, events older than 365 days are removed, but the user can specify the number of days in the past to use as a cut-off. Repeating events that have any occurrences after the cut-off day are not removed. calendarserver_purge_events should be run as a user with the same priviledges as the Calendar Server itself, as it needs to read and write data that belongs to the server. OPTIONS
-h, --help Display usage information -f, --config FILE Use the Calendar Server configuration specified in the given file. Defaults to /etc/caldavd/caldavd.plist. -d, --days NUMBER Specify how many days in the past to retain. Defaults to 365 days. -n, --dry-run Calculate and display how many events would be removed, but don't actually remove them. -v, --verbose Print progress information. FILES
/etc/caldavd/caldavd.plist The Calendar Server configuration file. SEE ALSO
caldavd(8) BSD
June 17, 2009 BSD
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