Docs/Drafts/SoftwareManagementGuide/ManageWithYum

4. Managing Software with yum
Use the  utility to modify the software on your system in four ways:


 * To install new software from package repositories
 * To install new software from an individual package file
 * To update existing software on your system
 * To remove unwanted software from your system

To use, specify a function and one or more packages or package groups. Each section below gives some examples.

For each operation,  downloads the latest package information from the configured repositories. If your system uses a slow network connection yum may require several seconds to download the repository indexes and the header files for each package.

The  utility searches these data files to determine the best set of actions to produce the required result, and displays the transaction for you to approve. The transaction may include the installation, update, or removal of additional packages, in order to resolve software dependencies.

This is an example of the transaction for installing :

============================================================================= Package                Arch       Version          Repository        Size

=
================================================================ Installing: tsclient               i386       0.132-6          base              247 k Installing for dependencies: rdesktop               i386       1.4.0-2          base              107 k

Transaction Summary

=
================================================================ Install     2 Package(s) Update      0 Package(s) Remove      0 Package(s) Total download size: 355 k Is this ok [y/N] :

Example 1. Format of  Transaction Reports

Review the list of changes, and then press [y]  to accept and begin the process. If you press [N]  or [Enter] ,  does not download or change any packages.

The  utility also imports the repository public key if it is not already installed on the rpm keyring.

This is an example of the public key import:

warning: rpmts_HdrFromFdno: Header V3 DSA signature: NOKEY, key ID 4f2a6fd2 public key not available for tsclient-0.132-6.i386.rpm Retrieving GPG key from file:///etc/pki/rpm-gpg/RPM-GPG-KEY-fedora Importing GPG key 0x4F2A6FD2 "Fedora Project " Is this ok [y/N] :

Example 2. Format of  Public Key Import

Check the public key, and then press [y]  to import the key and authorize the key for use. If you press [N]  or [Enter] ,  stops without installing any packages.

To ensure that downloaded packages are genuine,  verifies the digital signature of each package against the public key of the provider. Once all of the packages required for the transaction are successfully downloaded and verified,  applies them to your system.

4.1. Installing New Software with yum
To install the package, enter the command:

Enter the password for the root account when prompted.

To install the package group, enter the command:

Enter the password for the root account when prompted.

4.2. Updating Software with yum
To update the  to the latest version, type:

Enter the password for the root account when prompted.

To update all of the packages in the package group, enter the command:

Enter the password for the root account when prompted.

4.3. Removing Software with yum
To remove software,  examines your system for both the specified software, and any software which claims it as a dependency. The transaction to remove the software deletes both the software and the dependencies.

To remove the  package from your system, use the command:

Enter the password for the root account when prompted.

To remove all of the packages in the package group, enter the command:

Enter the password for the root account when prompted.