topic Re: Scheduling jobs using at command in Operating System - HP-UX

Scheduling jobs using at command

PM Srividhya — Thu, 22 Mar 2007 03:35:39 GMT

Hi all,

I have a list of scripts to be run on batch and I have a menu to start/stop them.

For e.g. On executing the menu_script, it displayes as following:
******************************
List of batches

1. script 1
2. script 2
3. script 3
.
.
10. stop batch jobs

99. exit
Enter option:
***********************************

On entering the option I want to put the script in the scheduler(run the script at some time interval - . ./script | at "now + 30 minutes").
This makes the script to run after 30 minutes, but it is not repating again.
I will be passing arguments from the menu_script to script1 and so I cannot give
echo ". $0" | at "" as the last statement in the script1 (as mentioned in the man page!)

How do I repeat run the script using at command? I don't want to use crontab.

Thanks,
Vidhya.

P.S. This time I'll be very generous in giving points ;O)

Re: Scheduling jobs using at command

Peter Godron — Thu, 22 Mar 2007 03:41:50 GMT

Hi,
you could include in your script1/script2.. files the at command, which would then trigger the repeat run.

Problem is, if the system is shut down, you will lose your at jobs, that is why cron was invented.

Re: Scheduling jobs using at command

Dennis Handly — Thu, 22 Mar 2007 03:59:52 GMT

>so I cannot give echo ". $0" | at "" as the last statement in the script1 (as mentioned in the man page!)
>How do I repeat run the script using at command?

If you can't edit the script, you can't repeat them. That is where you need to add the "at now + 30".

I suppose you could pass a parm -r ## to your script that tells it to optionally reschedule itself using at(1).

Re: Scheduling jobs using at command

SANTOSH S. MHASKAR — Thu, 22 Mar 2007 04:14:59 GMT

Hi,

How do u want to repeat it?

After certain interval OR after finishing running instance of script?

-Santosh

Re: Scheduling jobs using at command

PM Srividhya — Thu, 22 Mar 2007 04:54:57 GMT

I want to repeat it after regular intervals.

Re: Scheduling jobs using at command

Pete Randall — Thu, 22 Mar 2007 05:04:38 GMT

As Peter tried to explain, you need to put something like this in your script:

echo "/script1" | at now + 30 minutes

That way, every time the script is run, it tells at to do it again in 30 minutes.

Pete

Re: Scheduling jobs using at command

SANTOSH S. MHASKAR — Thu, 22 Mar 2007 05:12:40 GMT

Hi,

U can do like this,

create a file say JOB_PARAM

Enter following to it.
---------------------------
#! /usr/bin/ksh
JOB_REPEAT=TRUE

# Repeat interval in seconds
REPEAT_INTERVAL=1800 # 30 mins
--------------------------------

At the beginning of ur script add following
-------------------------------------------
. /JOB_PARAM

while [ JOB_REPEAT="TRUE" ]
do
at -f
sleep REPEAT_INTERVAL
done
-----------------------------------------

Thats all.

If u want to stop the job set

JOB_REPEAT=FALSE in JOB_PARAM

If u want to change repeat interval
change REPEAT_INTERVAL value in JOB_PARAM.

-Santosh

Re: Scheduling jobs using at command

Yogeeraj_1 — Thu, 22 Mar 2007 05:15:48 GMT

hi,

below a quote from "man at" which clear explains how to achieve this:

Add a command to the file named weekly-run in directory jobs in the home directory so that it automatically reschedules itself every time it runs. This example reschedules itself every Thursday at 1900 (7:00 p.m.):

echo "sh $HOME/jobs/weekly-run" | at 1900 thursday next week

hope this helps!

kind regards
yogeeraj

Re: Scheduling jobs using at command

Dennis Handly — Thu, 22 Mar 2007 05:24:31 GMT

>echo "sh $HOME/jobs/weekly-run" | at ...

I assume the reason for the silly echo instead of doing "at -f file", is to allow changes to the file between "now" and that future date?

Re: Scheduling jobs using at command

PM Srividhya — Thu, 22 Mar 2007 05:28:02 GMT

I think I have mentioned that I have to pass some arguments to the script from the calling script and so I cannot use it the way mentioned in the man page.

**I will be passing arguments from the menu_script to script1 and so I cannot give
echo ". $0" | at "" as the last statement in the script1 (as mentioned in the man page!)**

Re: Scheduling jobs using at command

SANTOSH S. MHASKAR — Thu, 22 Mar 2007 05:58:25 GMT

U can write in while loop as

sh |at now +
in place of
at -f

try this

-Santosh

Re: Scheduling jobs using at command

Dennis Handly — Thu, 22 Mar 2007 06:23:23 GMT

>**I will be passing arguments from the menu_script to script1 and so I cannot give
echo ". $0" | at "" as the last statement in the script1 (as mentioned in the man page!)**

Can you or can't you edit script1?? Passing args to script1 has nothing to do with editing it.

Re: Scheduling jobs using at command

Dennis Handly — Thu, 22 Mar 2007 06:28:38 GMT

You can of course have script1 pass its current parms back to itself when it invokes at(1).