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Unscheduled crontab execution

 
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# 15  
Old 05-07-2009
Quote:
Originally Posted by vbe
For me it would be:
all the sundays of 5th month AND the 25th day of that month
Hi vbe,
Yes, it must be the case - bit of quirk when you think that it's used for scheduling & when each field is qualified, you don't expect it to run on any other day - well I never did until now.

Since May 25th of 2008 until April 30th of this year, it's been sitting dormant - like I'd have expected. And the first Sunday in May it has come back to bite me.

I've actually removed the entry from the crontab for both users as this occurred in a Production environment. However I'll set up a test job under my account on the Development environment to see if it kicks off again this Sunday.

Cheers,
Cameron
 
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LEARN ABOUT BSD

cron

CRON(8) 						      System Manager's Manual							   CRON(8)

NAME

       cron - clock daemon

SYNOPSIS

       /usr/sbin/cron

DESCRIPTION

       Cron  executes commands at specified dates and times according to the instructions in the files /etc/crontab and /etc/crontab.local.  None,
       either one, or both of these files may be present.  Since cron never exits, it should only be executed once.  This is best done by  running
       cron from the initialization process through the file /etc/rc; see init(8).

       The  crontab files consist of lines of seven fields each.  The fields are separated by spaces or tabs.  The first five are integer patterns
       to specify:

       o minute (0-59)

       o hour (0-23)

       o day of the month (1-31)

       o month of the year (1-12)

       o day of the week (1-7 with 1 = Monday)

       Each of these patterns may contain:

       o a number in the range above

       o two numbers separated by a minus meaning a range inclusive

       o a list of numbers separated by commas meaning any of the numbers

       o an asterisk meaning all legal values

       The sixth field is a user name: the command will be run with that user's uid and permissions.  The seventh field consists of all  the  text
       on  a  line  following  the sixth field, including spaces and tabs; this text is treated as a command which is executed by the Shell at the
       specified times.  A percent character (``%'') in this field is translated to a new-line character.

       Both crontab files are checked by cron every minute, on the minute.

FILES

       /etc/crontab
       /etc/crontab.local

7th Edition							 October 23, 1996							   CRON(8)