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Full Discussion: Linux script for several cronjob
Top Forums Shell Programming and Scripting Linux script for several cronjob Post 302936934 by nino59 on Monday 2nd of March 2015 06:10:38 AM
Old 03-02-2015
Linux script for several cronjob
I have a linux server for my joomla website. I am importing xml feeds (around 200). The component give a tool which list all the cron job commands to automaticaly make the feeds import

I don't want to add one by one each cron job.

So my idea is to make one cron job which will call a shell script command. Inside this script I will put all these commands.

Problem1: I have to make the import one by one. So the shell script should look like

Code:
/usr/bin/php /home/website/public_html/superf/cli/com_cmdealaggregator_import_cron.php --id=2
wait... until import is finished...
/usr/bin/php /home/website/public_html/superf/cli/com_cmdealaggregator_import_cron.php --id=3 wait... until import is finished... etc...

But I guess we cannot know when import is finished? In this case we will wait a few minutes?

Problem 2: I have 200 feeds to import. If for example I run the cron job once per week and the cron job from previous week is not finished... Then I'll have 2 cron jobs running and this could use all the ressource of server... And it will be down. So I had the idea to put a line of code which will write a value in a indicator.txt file.

If inside indicator.txt file, there is line: cronjob_finished = true Then cron job can start

If inside indicator.txt file, there is line: cronjob_finished = false Then cron job cannot start

As a resume, the code should look like this:

Code:
#!/bin/sh
# This is some secure program that uses security.

# read indicator.txt

if cronjob_finished = false then
    STOP THE SCRIPT
else
    let's start the script
    /usr/bin/php /home/website/public_html/superf/cli/com_cmdealaggregator_import_cron.php --id=2
    wait... until import is finished... OR ... wait a few minutes...
    /usr/bin/php /home/website/public_html/superf/cli/com_cmdealaggregator_import_cron.php --id=3
    wait... until import is finished... OR ... wait a few minutes...
    /usr/bin/php /home/website/public_html/superf/cli/com_cmdealaggregator_import_cron.php --id=4
    wait... until import is finished... OR ... wait a few minutes...
    etc.......
    write in indicator.txt, cronjob_finished = true

fi

Is there any expert who will accept to help me please?
 

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LEARN ABOUT OPENDARWIN

queuedefs

queuedefs(4)							   File Formats 						      queuedefs(4)

NAME

       queuedefs - queue description file for at, batch, and cron

SYNOPSIS

       /etc/cron.d/queuedefs

DESCRIPTION

       The queuedefs file describes the characteristics of the queues managed by cron(1M). Each non-comment line in this file describes one queue.
       The format of the lines are as follows:

	      q.[njobj][nicen][nwaitw]

       The fields in this line are:

       q	The name of the queue. a is the default queue for jobs started by at(1); b is the default queue for jobs  started  by  batch  (see
		at(1)); c is the default queue for jobs run from a crontab(1) file.

       njob	The  maximum  number of jobs that can be run simultaneously in that queue; if more than njob jobs are ready to run, only the first
		njob jobs will be run, and the others will be run as jobs that are currently running terminate.  The default value is  100.

       nice	The nice(1) value to give to all jobs in that queue that are not run with a user ID of super-user.  The default value is 2.

       nwait	The number of seconds to wait before rescheduling a job that was deferred because more than njob jobs were running in  that  job's
		queue, or because the system-wide limit of jobs executing has been reached.  The default value is 60.

       Lines beginning with # are comments, and are ignored.

EXAMPLES

       Example 1: A sample file.

       #
       #
       a.4j1n
       b.2j2n90w

       This  file  specifies that the a queue, for at jobs, can have up to 4 jobs running simultaneously; those jobs will be run with a nice value
       of 1.  As no nwait value was given, if a job cannot be run because too many other jobs are running cron will wait 60 seconds before  trying
       again to run it.

       The  b  queue, for batch(1) jobs, can have up to 2 jobs running simultaneously; those jobs will be run with a nice(1) value of 2.  If a job
       cannot be run because too many other jobs are running, cron(1M) will wait 90 seconds before trying again to run it. All	other  queues  can
       have up to 100 jobs running simultaneously; they will be run with a nice value of 2, and if a job cannot be run because too many other jobs
       are running cron will wait 60 seconds before trying again to run it.

FILES

       /etc/cron.d/queuedefs	       queue description file for  at, batch, and  cron.

SEE ALSO

       at(1), crontab(1), nice(1), cron(1M)

SunOS 5.10							    1 Mar 1994							      queuedefs(4)
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