What crontab is in effect after reboot Post: 302484213

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Top Forums UNIX for Dummies Questions & Answers What crontab is in effect after reboot Post 302484213 by methyl on Thursday 30th of December 2010 06:45:53 AM

12-30-2010

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Quote:

Which is the preferred method to modify crontabs. To issue the crontab –e or to edit the file and reset it using the crontab [filename] method?

Personally I always extract a crontab file twice to an editing area using "crontab -l" redirected once under its correct name and once with a date suffix.

I never use "crontab -e" and prefer to edit the crontab in the editing area under its correct name with say "vi" and then finally publish the end-product with "crontab". At the final publish stage the "crontab" command validates the file.

There are several advantages with this approach:

1) You always have a backup. (It is remarkably easy to wipe a crontab file).

2) You have before and after files which you can check with "diff" before publishing the crontab.

3) You have control over when your crontab becomes live. I have prepared and checked an edited crontab in advance by this method. I have also taken lines from a test system crontab and injected them into the live crontab by this method.

4) You create an archive of changes which can be useful for looking up what you did last time.

5) On some sites such an audit trail is mandatory.

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yum-cron

yum-cron(8)															       yum-cron(8)

NAME

       yum-cron - an interface to convieniently call yum from cron

SYNOPSIS

       yum-cron [config-file]

DESCRIPTION

       yum-cron  is  an  alternate  interface to yum that is optimised to be convenient to call from cron.  It provides methods to keep repository
       metadata up to date, and to check for, download, and apply updates.  Rather than accepting many different command line arguments, the  dif-
       ferent functions of yum-cron can be accessed through config files.

       config-file  is	used  to optionally specify the path to the configuration file to use.	If it is not given, the default configuration file
       will be used.  It is useful to be able to specify different configuration files for different use cases.  For  example,	one  configuration
       file  might  be set to update the repository metadata, and a line could be added to the crontab to run yum-cron frequently using this file.
       Then, another configuration file might be set to install updates, and yum-cron could be run from cron using this file just once each day.

FILES

       /etc/yum/yum-cron.conf
       /etc/yum/yum-cron-hourly.conf

SEE ALSO

       yum (8)

AUTHORS

       See the Authors file included with this program.

BUGS

       There of course aren't any bugs, but if you find any, you should email
	the mailing list, yum@lists.baseurl.org, or consult bugzilla.

Nick Jacek															       yum-cron(8)