"AIX cron job is running everyday instead of on a particular day"

Post #303023465 by rbatte1 on Monday 17th of September 2018 11:54:42 AM

Yes, I fell over the some 20 years ago with the same result. It seems that cron does not make sure that all conditions for the day match, so you may find that it runs every day between 15th & 21st each month AND every Sunday.

You would think that what you have set up is perfectly sensible, but sadly the cron designers had other ideas.

I got round this by running a shell script everyday that decided if I was on the correct day and correct week, and if so then it progressed to run the script I really wanted. it is annoying and I sympathise, but that was my way round it.



From the crontab file manual (man 5 crontab) I get this:-
Quote:
Note: The day of a commandís execution can be specified by two fields ó day of month, and day of week. If both fields are restricted (ie, arenít *), the command will be run when
either field matches the current time. For example,
"30 4 1,15 * 5" would cause a command to be run at 4:30 am on the 1st and 15th of each month, plus every Friday.

I hope that this helps,
Robin
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yum-cron(8)															       yum-cron(8)

NAME
yum-cron - an interface to convieniently call yum from cron SYNOPSIS
yum-cron [config-file] DESCRIPTION
yum-cron is an alternate interface to yum that is optimised to be convenient to call from cron. It provides methods to keep repository metadata up to date, and to check for, download, and apply updates. Rather than accepting many different command line arguments, the dif- ferent functions of yum-cron can be accessed through config files. config-file is used to optionally specify the path to the configuration file to use. If it is not given, the default configuration file will be used. It is useful to be able to specify different configuration files for different use cases. For example, one configuration file might be set to update the repository metadata, and a line could be added to the crontab to run yum-cron frequently using this file. Then, another configuration file might be set to install updates, and yum-cron could be run from cron using this file just once each day. FILES
/etc/yum/yum-cron.conf /etc/yum/yum-cron-hourly.conf SEE ALSO
yum (8) AUTHORS
See the Authors file included with this program. BUGS
There of course aren't any bugs, but if you find any, you should email the mailing list, yum@lists.baseurl.org, or consult bugzilla. Nick Jacek yum-cron(8)

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