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Full Discussion: AIX cron job is running everyday instead of on a particular day
Operating Systems AIX AIX cron job is running everyday instead of on a particular day Post 303023467 by MadeInGermany on Monday 17th of September 2018 12:48:23 PM
Old 09-17-2018
That means cron treats the dom field and the dow field as OR.
To make an AND, you put one field into the crontab and make your script exit on the other condition. For example
Code:
45 4 * * 0 /home/user1/myscript.sh >/dev/null 2>&1 # run this every sunday

And at the beginning of myscript.sh you put
Code:
# exit if day-of-month is not 15..21
dom=`date +%d`
[ $dom -ge 15 -a $dom -le 21 ] || exit
# the real script follows
...

Or, the other way round:
Code:
45 4 15-21 * * /home/user1/myscript.sh >/dev/null 2>&1 # run this every day 15..21

And at the beginning of myscript.sh you put
Code:
# exit if today is not Sunday
dow=`date +%w`
[ $dow -eq 0 ] || exit
# the real script follows
...

Last edited by MadeInGermany; 09-17-2018 at 02:01 PM..
These 2 Users Gave Thanks to MadeInGermany For This Post:
Kumar7997 rbatte1
 

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LEARN ABOUT XFREE86

queuedefs

queuedefs(4)							   File Formats 						      queuedefs(4)

NAME

       queuedefs - queue description file for at, batch, and cron

SYNOPSIS

       /etc/cron.d/queuedefs

DESCRIPTION

       The queuedefs file describes the characteristics of the queues managed by cron(1M). Each non-comment line in this file describes one queue.
       The format of the lines are as follows:

	      q.[njobj][nicen][nwaitw]

       The fields in this line are:

       q	The name of the queue. a is the default queue for jobs started by at(1); b is the default queue for jobs  started  by  batch  (see
		at(1)); c is the default queue for jobs run from a crontab(1) file.

       njob	The  maximum  number of jobs that can be run simultaneously in that queue; if more than njob jobs are ready to run, only the first
		njob jobs will be run, and the others will be run as jobs that are currently running terminate.  The default value is  100.

       nice	The nice(1) value to give to all jobs in that queue that are not run with a user ID of super-user.  The default value is 2.

       nwait	The number of seconds to wait before rescheduling a job that was deferred because more than njob jobs were running in  that  job's
		queue, or because the system-wide limit of jobs executing has been reached.  The default value is 60.

       Lines beginning with # are comments, and are ignored.

EXAMPLES

       Example 1: A sample file.

       #
       #
       a.4j1n
       b.2j2n90w

       This  file  specifies that the a queue, for at jobs, can have up to 4 jobs running simultaneously; those jobs will be run with a nice value
       of 1.  As no nwait value was given, if a job cannot be run because too many other jobs are running cron will wait 60 seconds before  trying
       again to run it.

       The  b  queue, for batch(1) jobs, can have up to 2 jobs running simultaneously; those jobs will be run with a nice(1) value of 2.  If a job
       cannot be run because too many other jobs are running, cron(1M) will wait 90 seconds before trying again to run it. All	other  queues  can
       have up to 100 jobs running simultaneously; they will be run with a nice value of 2, and if a job cannot be run because too many other jobs
       are running cron will wait 60 seconds before trying again to run it.

FILES

       /etc/cron.d/queuedefs	       queue description file for  at, batch, and  cron.

SEE ALSO

       at(1), crontab(1), nice(1), cron(1M)

SunOS 5.10							    1 Mar 1994							      queuedefs(4)
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