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Full Discussion: Cron job shell script..
Top Forums Shell Programming and Scripting Cron job shell script.. Post 302342129 by jim mcnamara on Friday 7th of August 2009 12:41:11 PM
Old 08-07-2009
Code:
*     *   *   *    *  command to be executed
-     -    -    -    -
|     |     |     |     |
|     |     |     |     +----- day of week (0 - 6) (Sunday=0)
|     |     |     +------- month (1 - 12)
|     |     +--------- day of month (1 - 31)
|     +----------- hour (0 - 23)
+------------- min (0 - 59)

Your entry will run at 1:30 am once a day. 90 minutes requires two separate crontab entries:

Code:
0 0,3,6,9,12,15,18,21 * * * [your cmd]

30 1,4,7,10,13,16,19,22 * * * [your cmd]

the [your cmd] is identical in the two entries. Also it is general MUCH better to specify
a shell script to run rather than a command. You simply edit the shell script as the complexity of the requirement morphs. read: users complain
 

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rt-email-dashboards(8)					     Request Tracker Reference					    rt-email-dashboards(8)

NAME
rt-email-dashboards - Send email dashboards SYNOPSIS
rt-email-dashboards [options] DESCRIPTION
This tool will send users email based on how they have subscribed to dashboards. A dashboard is a set of saved searches, the subscription controls how often that dashboard is sent and how it's displayed. Each subscription has an hour, and possibly day of week or day of month. These are taken to be in the user's timezone if available, UTC otherwise. SETUP
You'll need to have cron run this script every hour. Here's an example crontab entry to do this. 0 * * * * /usr/bin/perl /opt/rt4/local/sbin/rt-email-dashboards This will run the script every hour on the hour. This may need some further tweaking to be run as the correct user. OPTIONS
This tool supports a few options. Most are for debugging. -h --help Display this documentation --dryrun Figure out which dashboards would be sent, but don't actually generate or email any of them --time SECONDS Instead of using the current time to figure out which dashboards should be sent, use SECONDS (usually since midnight Jan 1st, 1970, so 1192216018 would be Oct 12 19:06:58 GMT 2007). --epoch SECONDS Back-compat for --time SECONDS. --all Ignore subscription frequency when considering each dashboard (should only be used with --dryrun for testing and debugging) perl v5.14.2 2013-05-22 rt-email-dashboards(8)
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