Yum

External

• http://en.wikipedia.org/wiki/Yellowdog_Updater,_Modified
• http://prefetch.net/articles/yum.html

Internal

• Linux Commands

Overview

yum is an interactive, rpm-based package manager. It can automatically perform system updates, including dependency analysis and obsolete processing based on repository metadata. It can also perform installation of new packages, removal of old packages and perform queries on the installed and/or available packages among many other commands/services.

yum is configured in /etc/yum.conf. This is where the place yum logs is configured (by default /var/log/yum.log).

    /etc/yum.repos.d/

Recipes

Queries

Find Packages that Might Contain a Certain Command

yum provides sealert

Find Whether a Package is Installed

yum list installed | grep <package-name>

Example of positive hit:

[root@ns ~]# yum list installed | grep httpd
httpd.x86_64                     2.4.6-40.el7                @rhel-7-server-rpms
httpd-tools.x86_64               2.4.6-40.el7                @rhel-7-server-rpms

List of Everything Installed

yum info

Information about a Specific Package

yum info <package-name>

This can be used for information on packages that already have been installed or on package that has't been installed yet. If the package has been installed, yum info will report Installed Packages, otherwise will say Available.

Generic Search

yum search <string>

Update All Packages

yum -y update

Update a Package

yum update <package-name>

Install a Package

yum install <package-name>

Uninstall a Package

yum remove <package-name>