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Amiga Format CD 44
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Amiga Format CD44 (1999-08-26)(Future Publishing)(GB)(Track 1 of 3)[!][issue 1999-10].iso
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merlin
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scheduler.doc
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1999-07-12
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=====( Scheduler V1.10 )=============================================
Trion 'Scheduler' Utility.
(c) Copyright Paul Spijkerman, '96-'99. All rights reserved.
Written for use with the Trion merlin package.
===================================================================
The trion scheduler is a programm that starts programms and
script at specific times. You can do things what you do regularly
do by a programm .. like calling out and do maintenance.
It is very much like a cron utility with a few little differences.
It has an optional window with the time in big digits and a list
of the next events.
When it is started with no arguments it reads "mcp:cfg/scheduler.cfg"
instead of a crontab and keeps a log in "mcp:log/scheduler.log",
but you can change this by using arguments on the command line.
These are the arguments the Scheduler understands:
CONFIG <path/name> default: mcp:cfg/scheduler.cfg
LOG <path/name> default: mcp:log/scheduler.log
WINDOW <xpos> <ypos> default: x=450 y=55
ONTRION default: On Workbench
NOWINDOW
PRI <priority> default: priority=0
STACK <stack> default: stack=2048
12HOUR or 24HOUR
The programm default opens a window with a clock and a list of
events, but by using NOWINDOW this can be overruled.
When you use the ONTRION option the window will be opened
on the Trion public screen when available instead of the
workbench screen.
Note that you can't iconize the TrionRM screen until
you close the scheduler window.
Note that it isn't a problem to have the screen always open, but
it slows the mail processor a little when unpacking mail because
it has to update the screen after each message.
The Trion:down script still works because it also quits the
scheduler.
Couldn't think of a better way to implement this at this moment,
well actually I just thougth of something.
Just add to the "event" program commands to Iconize and DeIconize
the scheduler and then call the "event" program when TrionRM
is Iconized or Deiconized. Have to think if that is a
really smart thing to do.
The clock in the window can be of the 12 hour (AM/PM) type or
of of the 24 hour type depending on what argument you use
on the command line. Default is the 12 hour type.
Also there is a utility called "event" what was meant to
add events ... but at this time it can be used to remove
the scheduler from the system by typeing "event -Q".
The format of the scheduler.cfg (crontab) looks very much like
that of other cron utilities:
min hour day month DayOfWeek "command args" ["Description"]
The only difference is the an optional description for use
in the scheduler window. And because there has to be some
separation between commands and description they both
have to be between "".
Also there are some arguments that can be placed after
the command part that are filtered out by scheduler
and used for starting a programm:
>outfile <- redirect output to "outfile"
>>outfile <- same but add to existing file
<infile <- redirect input from "infile"
:PRI <prioriteit> <- Suplies a priority for this task
:STACK <stack> <- Suplies an amount of stack for this task
:STDIO <- Input/Output of this task is redirected
to the shell where scheduler was started
from instead of NIL:
How to make a scheduler.cfg (Crontab)..
The scheduler.cfg consists or 3 types or lines, blank lines,
comment lines and event lines.
Comment lines start with a "#" or a ";" character.
Event lines have this format:
min hour day month DayOfWeek "command args" ["Description"]
The first 5 fields, are specifications for what range of values this
command has to be run. A "*" means that any value is acceptable.
The fields can consist of a row of numbers separated by a ",".
Also ranges (numbers separated by a "-") may be used instead of
a number.
Months range from 1 (January) to 12 (December).
The Day Of Week ranges from 0 (Sunday) to 6 (Saturday).
For example:
* * * * * "Date"
Would run the command Date every minute of every hour of every day
of every month regardless of the day of the week.
15 * * * * "Date"
Only runs on the 15th minute of each hour.
0 10,12-16,18 * * * "Date"
Runs at the start of the hours 10, 12, 13, 14, 14, 16 and 18.
0 3 * * 2,4,6 "c:execute trion:scripts/PollHub 14:103/3" "Call Paul"
This calls out on Tuesday, Thursday and Saterday at 3 AM.