crontabs man page on Oracle

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CRONTABS(4)		    Crontabs users' Manual		   CRONTABS(4)

       crontabs - configuration and scripts for running periodical jobs

       run-parts [--list|--test]<directory>

       Crontabs	 is  a historical name for the run-parts script and the system
       crontab. The run-parts script runs all  executables  in	the  specified
       directory.   Run-parts runs all executables in the specified directory.
       The execution of files can  be  allowed	or  denied  by	creating  file
       jobs.allow or jobs.deny which worked similar as other allow/deny config
       files. The file must be created in the specified directory.

       --list print names of all files (not limited to executables), but don't
	      run them. This option can't be used with test option.

       --test print names of files, which would be run.

	      Randomization  of	 jobs  can  be	configured in the /etc/syscon‐
	      fig/run-parts file. To enable randomization  of  jobs,  set  the
	      RANDOMIZE	 parameter  to	1  and	set the RANDOM parameter to an
	      integer which determines a random seed.  Additionally,  you  may
	      configure	 the  RANDOMTIME  parameter  (again,  by specifying an
	      integer) to provide an additional level of  randomization.  Jobs
	      are not randomized when the RANDOM and RANDOMTIME parameters are
	      set to 0. Values in these two parameters must be	set  to	 1  or
	      larger to provide a good enough randomization.

	      Randomization  of	 cron  jobs can be useful for shared networks,
	      where multiple cron jobs executed at once can  cause  spikes  in
	      traffic, especially during daily jobs. With randomized jobs, the
	      workload is evenly distributed throughout the day.


       Historically the crontab file contained configuration which called run-
       parts  on  files in cron.{daily,weekly,monthly} directories. These jobs
       are now run indirectly through anacron  to  prevent  conflicts  between
       cron  and  anacron.  That means the anacron package has to be installed
       if the jobs in these  directories  should  be  running.	Refer  to  the
       anacron(8) how to limit the time of day of the job execution.

       /etc/cron.daily/jobs.deny  could	 contain  for  example 0logwatch which
       forbid execution of this script.

       anacron(8), crontab(5)

Marcela Mašláňová		  2012-08-29			   CRONTABS(4)

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