4.3BSD-Reno/share/man/cat8/cron.0

CRON(8)                       1990			  CRON(8)



NNAAMMEE
     cron - clock daemon

SSYYNNOOPPSSIISS
     ccrroonn

DDEESSCCRRIIPPTTIIOONN
     _C_r_o_n executes commands at specified dates and times accord-
     ing to the instructions in the files /etc/crontab and
     /etc/crontab.local.  None, either one, or both of these
     files may be present.  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).

     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:

     o+ minute (0-59)
     o+ hour (0-23)
     o+ day of the month (1-31)
     o+ month of the year (1-12)
     o+ day of the week (1-7 with 1 = Monday)

     Each of these patterns may contain:

     o+ a number in the range above
     o+ two numbers separated by a minus meaning a range inclusive
     o+ a list of numbers separated by commas meaning any of the
       numbers
     o+ 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, includ-
     ing 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 _c_r_o_n every minute, on the
     minute.

FFIILLEESS
     /etc/crontab
     /etc/crontab.local








Printed 7/27/90               June				1