CRON(8)                 COMMAND REFERENCE                 CRON(8)



NAME
     cron - clock daemon

SYNOPSIS
     /etc/cron

DESCRIPTION
     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 init(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
     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 sixth 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.

EXAMPLES
     The following example runs the program atrun every 15
     minutes.

          0,15,30,45 * * * * /usr/lib/atrun

     The next example shows how cron(8) can be used to run jobs
     as someone other than the super-user (root).

          0 0 * * * su daemon < /usr/local/lib/uucp.daily

FILES
     /usr/lib/crontab

RETURN VALUE
     [NO_ERRS]      Command completed without error.

SEE ALSO
     at(1).





Printed 4/6/89                                                  1

%%index%%
na:240,71;
sy:311,195;
de:506,1597;
ex:2103,442;
fi:2545,105;
rv:2650,177;
se:2827,99;
%%index%%000000000120