Fedora Linux

=========
Install 0 Package(s)
Update 0 Package(s)
Remove 39 Package(s)
Total download size: 0
Is this ok [y/N]: n
Exiting on user Command
Complete!

Here, the removal of httpd would cause dependency failures for 38 other packages, so yum offered to remove all 39 packages together. In this case, the user elected not to proceed, so yum exited.

yum can also update software:

# yum update
Setting up Update Process
Setting up repositories
...(Lines snipped)...
Transaction Summary
================================================================= =========
Install 5 Package(s)
Update 19 Package(s)
Remove 0 Package(s)
Total download size: 27 M
Is this ok [y/N]: y
Downloading Packages:
(1/24): bind-utils-9.3.1- 100% |=========================| 146 kB 00:00
(2/24): esound-0.2.36-0.f 100% |=========================| 127 kB 00:00
...(Lines snipped)...
Running Transaction Test
Repackage : bind-utils ####################### [ 0/43]
Repackage : esound ####################### [ 0/43]
...(Lines snipped)...
Installing: GFS-kernel ####################### [22/43]
Updating : bind-libbind-devel ####################### [23/43]
Installed: GFS-kernel.i686 0:2.6.11.8-20050601.152643.FC4.17 cman-kernel.i686
...(Lines snipped)...
pam.i386 0:0.79-9.6 pam-devel.i386 0:0.79-9.6 sudo.i386 0:1.6.8p8-2.3
Complete!

For each of the currently installed packages, yum checks to see if a newer version exists in any of the repositories and queues the update of those packages plus the installation of any packages required for dependency resolution. After confirming the package set with the user, the packages are downloaded and the update/installation is performed through the RPM system.

To update one specific package (and dependencies), list the package name as an argument:

# yum update kernel

yum also offers a number of information and miscellaneous options; the most useful are shown in Table 5-5 . However, most of these operations are more easily performed using the graphical user interface (GUI).

Table 5-5. Information and miscellaneous commands for yum

Option	Description
list	Lists available packages.
check-update	Verifies whether any updates are available. An exit code of 100 indicates that updates are ready for installation.
whatprovides capability	Displays the name of any packages that provide the listed capability, which may be an RPM-style capability name or a filename.
provides capability
search keyword	Searches for a package with keyword in the description, summary, packager name, or package name metadata. The search is case-insensitive.
info package	Displays metadata about package (similar to rpm - qi).
deplist package	Displays the dependencies of package, including the names of the packages that will resolve those dependencies.
localinstall rpm_file	Installs or removes the package contained in the local rpm_file and, if necessary, resolves any dependencies using the repositories.