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Author Topic: Cron job commands  (Read 145 times)
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« on: January 24, 2007, 07:46:37 pm »

According to H-Sphere Documentation:
The format of a cron command is very much the V7 standard, with a number
of upward-compatible extensions. Each line has five time and date
fields, followed by a user name if this is the system crontab file,
followed by a command. Commands are executed by cron(8) when the minute,
hour, and month of year fields match the current time, and when at
least one of the two day fields (day of month, or day of week) match the
current time (see ``Note'' below). Note that this means that non-existant
times, such as "missing hours" during daylight savings conversion, will
never match, causing jobs scheduled during the "missing times" not to
be run. Similarly, times that occur more than once (again, during
daylight savings conversion) will cause matching jobs to be run twice.

cron(8) examines cron entries once every minute.

The time and date fields are:

field allowed values
----- --------------
minute 0-59
hour 0-23
day of month 1-31
month 1-12 (or names, see below)
day of week 0-7 (0 or 7 is Sun, or use names)

A field may be an asterisk (*), which always stands for ``first-last''.

Ranges of numbers are allowed. Ranges are two numbers separated with a
hyphen. The specified range is inclusive. For example, 8-11 for an ``hours''
entry specifies execution at hours 8, 9, 10 and 11.

Lists are allowed. A list is a set of numbers (or ranges) separated by
commas. Examples:
``1,2,5,9'', ``0-4,8-12''.
Step values can be used in conjunction with ranges. Following a range
with ``/'' specifies skips of the number's value through the range. For
example, ``0-23/2'' can be used in the hours field to specify command
execution every other hour (the alternative in the V7 standard is ``0,2,4,6,8,10,12,14,16,18,20,22'').
Steps are also permitted after an asterisk, so if you want to say ``every
two hours'', just use ``*/2''.

Names can also be used for the ``month'' and ``day of week'' fields. Use
the first three letters of the particular day or month (case doesn't
matter). Ranges or lists of names are not allowed.

The ``sixth'' field (the rest of the line) specifies the command to be
run. The entire command portion of the line, up to a newline or %
character, will be executed by /bin/sh or by the shell specified in the
SHELL variable of the cronfile. Percent-signs (%) in the command, unless
escaped with backslash (), will be changed into newline characters, and
all data after the first % will be sent to the command as standard
input.

Therefore, to run your scripts once a day, enter the time under "Hour"
that you want it to run. Say you want it to run at 11pm, enter "23" (0
is midnight, 12 is noon). And then, if file.cgi is under your webroot,
you would put in the command line:
/hsphere/local/home/username/domain.com/cgi-bin/file.cgi
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