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In 1983, Richard Stallman announced the GNU (short for "GNU's Not Unix") project, to create a proprietary, commercial software Unix-like system.
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yum-cron(8) [centos man page]

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

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,, or consult bugzilla. Nick Jacek yum-cron(8)

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yum-updatesd.conf(5)					  yum-updatesd configuration file				      yum-updatesd.conf(5)

yum-updatesd.conf - Configuration file for yum-updatesd(8). DESCRIPTION
yum-updatesd uses a configuration file at /etc/yum/yum-updatesd.conf. Additional configuration information is read from the main yum.conf (5) configuration file. PARAMETERS
There is one section in the yum-updatesd configuration file, main, which defines all of the global configuration options. [main] OPTIONS The [main] section must exist for yum-updatesd to do anything. It consists of the following options: run_interval Number of seconds to wait between checks for available updates. updaterefresh Minimum number of seconds between update information refreshes to avoid hitting the server too often. emit_via List of ways to emit update notification. Valid values are `email', `dbus' and `syslog'. do_update Boolean option to decide whether or not updates should be automatically applied. Defaults to False. do_download_deps Boolean option to decide whether or not updates should be automatically downloaded. Defaults to False. do_download_deps Boolean option to automatically download dependencies of packages which need updating as well. Defaults to False. MAIL OPTIONS
email_to List of email addresses to send update notification to. Defaults to `root@localhost'. email_from Email address for update notifications to be from. Defaults to `yum-updatesd@localhost'. SYSLOG OPTIONS
syslog_facility What syslog facility should be used. Defaults to `DAEMON'. syslog_level Level of syslog messages. Defaults to `WARN'. FILES
/etc/yum/yum-updatesd.conf SEE ALSO
yum-updatesd(8) yum.conf(5) Jeremy Katz yum-updatesd.conf(5)

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