[CentOS] run script on cron job only run on first Saturdat every month???

On Wed, Jul 31, 2013 at 08:52:02AM -0700, Bart Schaefer wrote:
> As Keith said, it's because the conditions are OR'd.  A careful reading of
> crontab(5) shows that the algorithm is [minute AND hour AND (restricted day
> of week OR restricted day of month) AND month].  Day of week and day of
> month only restrict independently when one or both is "*".

The manpage explicitly says

       Note: The day of a command's execution can be specified by two fields --
       day of month, and day of week.  If  both  fields  are  restricted  (ie,
       aren't  *),  the command will be run when either field matches the cur-
       rent 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.


-- 

rgds
Stephen