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5.6. Updating Software

In general yum update command is required to try to update a package or group of packages already installed. The yum update verifies that the packages to be updated are installed, this is a difference in behavior shown by rpm -U paquete.rpm command.
# yum update zzuf
Loaded plugins:aliases, downloadonly, fastestmirror, list-data,
Setting up Update Process
Package zzuf available but not instaled.
No package selected for update

5.6.1. Updating a Package

This yum option is natural and intuitive as previously noted, see the following simple example of use specifying a package to update.
# su -c "yum update xfig"