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Full Discussion: Cron jobs
Operating Systems Linux Cron jobs Post 302365432 by anaigini45 on Tuesday 27th of October 2009 03:57:09 AM
Old 10-27-2009
Cron jobs

Hi,

I am a Linux administrator (newbie) in my company. The distro being used in the servers here is Centos 5.3

Just need to know, as a Linux administrator is it better for me to use /etc/crontab to set my cron jobs. I do not want to use the crontab -e to schedule my cron jobs.

That means can I edit the default settings (to different time settings) in etc/crontab in order to get my database to backed up?

And another question is, how do I set the cron job to only show the current week's backup (in the database backup directory) and remove the previous week's backups.

One week would mean Monday to Saturday.

Pls help.

Tqs.

Last edited by pludi; 10-27-2009 at 06:16 AM..
 

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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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