cron man page on OPENSTEP

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CRON(8)								       CRON(8)

NAME
       cron - clock daemon

SYNOPSIS
       /usr/etc/cron

DESCRIPTION
       Cron  executes  commands	 at specified dates and times according to the
       instructions	in     the     files	 /private/etc/crontab	   and
       /private/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:

       · minute (0-59)

       · hour (0-23)

       · day of the month (1-31)

       · month of the year (1-12)

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

       Each of these patterns may contain:

       · a number in the range above

       · two numbers separated by a minus meaning a range inclusive

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

       · 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
       /private/etc/crontab
       /private/etc/crontab.local
       /usr/lib/crontab (link to /private/etc/crontab)
       /usr/lib/crontab.local (link to /private/etc/crontab.local)

7th Edition			 May 16, 1986			       CRON(8)
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