Basic tutorials for using Yum under Linux

The software upgrade is an improvement of the software function and the security upgrade. Similar to the windows system, the software needs to be updated and upgraded regularly under the Linux operating system
, keeping the software always in the latest state. Linux operating system
upgrade can be divided into automatic upgrade and manual upgrade two ways: automatic upgrade is generally carried out under an authorized Linux distribution or free linux distribution, as long as the upgrade command is entered, the system will The upgrade is done automatically without manual intervention. Yum is the abbreviation of yellowdog updater modified, yellow dog is also a Linux distribution, but Redhat has used this upgrade technology to its own distribution to form the current yum. Yum is a commonly used tool for automatic Linux upgrade. It can be upgraded automatically through the yum tool with the Internet. For example, an authorized Redhat Linux operating system, or a Centos Linux system, as long as your system can connect to the Internet, enter yum update to achieve automatic system upgrade. The system upgrade through yum is essentially a yum command to download the RPM package on the specified remote Internet host, and then automatically install, and resolve the dependencies between the various software. Manual upgrade is a targeted upgrade of a certain system software, such as upgrading the system's ssh login tool, gcc compiler tool, and so on. Manual upgrade is actually through the RPM package tool to achieve software updates, so you may encounter software dependencies when upgrading the software, the upgrade is relatively troublesome. The following describes how to set up the yum tool under Centos Linux 4.4 to automatically upgrade the system. 1. Yum installation and configuration (1) yum installation check yum has been installed: [root@localhost ~]# rpm -qa