4BSD/usr/man/cat8/cron.8

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CRON(8)             UNIX Programmer's Manual              CRON(8)



NAME
     cron - clock daemon

SYNOPSIS
     /etc/cron

DESCRIPTION
     _C_r_o_n executes commands at specified dates and times accord-
     ing to the instructions in the file /usr/lib/crontab.  Since
     _c_r_o_n never exits, it should only be executed once.  This is
     best done by running _c_r_o_n from the initialization process
     through the file /etc/rc; see _i_n_i_t(8).

     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 con-
     tain 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 sixth field is a string that is exe-
     cuted by the Shell at the specified times.  A percent char-
     acter in this field is translated 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 _c_r_o_n every minute.

FILES
     /usr/lib/crontab























Printed 11/10/80                                                1