RE: Unix - scheduling

He specified that 0 */4 * * * would cause it to run every 4 hours. He provided an example.

-----Original Message-----
Sent: Tuesday, July 02, 2002 11:13 AM
To: Multiple recipients of list ORACLE-L

• Nils Höglund <nils_at_naqua.se> on 07/02/02 03:28:20 -0800

> 0 */4 * * * your_command

$ man 5 cronttab;

     The time and date fields are:

              field          allowed values
              -----          --------------
              minute         0-59
              hour           0-23
              day of month   1-31
              month          1-12 (or names, see below)
              day of week    0-7 (0 or 7 is Sun, or use names)

       A field may be an asterisk (*), which always stands for ``first-last''.

       Ranges  of numbers are allowed.  Ranges are two numbers separated with a hyphen.  The specified range
       is inclusive.  For example, 8-11 for an ``hours'' entry specifies execution at hours 8, 9, 10 and 11.

       Lists  are  allowed.   A  list  is  a  set  of  numbers  (or  ranges)
separated by commas.  Examples:
       ``1,2,5,9'', ``0-4,8-12''.

Question: how does "0 */4 * * *" cause something to run every 4 weeks? Unless your version has a different field order. It might work to try "* */628 * * *" but I'm not sure that cron allows n>24 for the hourly divisor.

The combination of date and weekday can approximate the 4-week cycle.

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