CRON(8)                                                   CRON(8)

          cron - clock daemon


          Cron executes commands at specified dates and times accord-
          ing to the instructions in the file /etc/crontab. Since cron
          never exits, it should be executed only once, by running
          cron from the initialization process through the file
          /etc/rc; see init(8).

          Crontab consists of lines of seven fields each.  The fields
          are separated by spaces or tabs.  The first field specifies
          the user under whose uid and gid the command should be exe-
          cuted.  The next 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 numbers; or an asterisk meaning all legal values.
          The seventh field is a string that is executed by the shell
          at the specified times.  A percent character in this field
          is translated to a new-line character.  Only the first line
          (up to a % or end of line) of the command 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.