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Unix Version 7 - man page for cron (v7 section 8)

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CRON(8) 										  CRON(8)

       cron - clock daemon


       Cron  executes  commands at specified dates and times according to the instructions in the
       file /usr/lib/crontab.  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

       Crontab consists of lines of six fields each.  The fields are separated by spaces or tabs.
       The  first five are integer patterns to specify the minute (0-59), hour (0-23), day of the
       month (1-31), month of the year (1-12), and 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  num-
       bers;  or  an asterisk meaning all legal values.  The sixth field is a string that is exe-
       cuted by the Shell at the specified times.  A percent character in this	field  is  trans-
       lated to a new-line character.  Only the first line (up to a % or end of line) of the com-
       mand field is executed by the Shell.  The other lines are made available to the command as
       standard input.

       Crontab is examined by cron every minute.


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