The basics of Yum usage in CentOS

Yum online upgrade mechanism. After analyzing the title database of RPM, Yum produces a dependency-dependent solution based on the dependencies of each software, and can then automatically handle the software's dependency property issues to resolve software installation or removal and upgrade issues.

In the actual work, we mainly apply Yum's query, install, upgrade and delete functions

1. Enquiry

(1) Package view

List: Lists all the software names provided above the Yum server, as shown in just a few. #yum List

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(2) List updates: Lists what software is available for native upgrades. If only a few #yum list updates are displayed

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(7) Repolist: Lists all available warehouses that have been configured. such as #yum repolist

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(9) List name*, you can see what the software name begins with name, and which ones are not already installed. For example #yum list pam*

Such as.

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(one) GroupInfo: View information about a group.

(groupinstall): Install a group of software.

2. Installation

(1) Install: Installs a software. such as #yum install Zsh

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(3) Reinstall: Reinstall, overwrite the installation. For example #yum Reinstall ZSH

3. Upgrade

(1) Update: Upgrade a software. For example #yum update zsh

(2) Downgrade: Downgrade a software. For example, downgrade zsh-4.3.10-9.el6.x86_64.rpm to zsh-4.3.10-7.el6.x86_64.rpm

#yum downgrade zsh-4.3.10-7.el6.x86_64.rpm

(3) Check-update: Check the software that needs to be updated. For example #yum check-update

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4. Uninstall

Remove: Remove a software. such as #yum remove zsh

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(1) List all package groups: Grouplist, such as #yum Grouplis

(2) Show specified package group details: groupinfo, e.g. #yum groupinfo group_name

(3) Installation: Groupinstall, e.g. #yum Groupinstall group_name

(4) Uninstall: Groupremove, e.g. #yum Groupremvoe group_name

(5) Upgrade: groupupdate, e.g. #yum groupupdate group_name

6, use Install, update, remove can also directly manage the package group

Install package Group: #yum Install @ "Group_name"

Upgrade Package Group: #yum update @ "group_name"

Delete package Group: #yum Remove @ "group_name"

7. Options available for the Yum command:

-Y: Auto Answer "yes"

--disablerepo=: Temporarily disables a repository that is configured and enabled in the configuration file;

--enablerepo=: Temporarily enables a specified repo;

--nogpgcheck: Prohibit package check

8. Yum has built-in variables: For storing information about the current platform.

(1) $raleasever: Major version number of the current OS release

For example, for Centos6.6 x86_64, the major version number is 6

(2) $arch: Platform

For example, i386,i486

(3) $basearch: Basic Platform,

For example, the basic platform of i686,i586,i486 and i386 is the same as i386;

(4) $YUM 0-$YUM 9

Example: baseurl=http://repo.magedu.com/centos/$releasever/$basearch

The current system is CentOS 6.6 x86_64,http://repo.magedu.com/centos/6/x86_64

This article from the "Linux Learning" blog, declined reprint!

The basics of Yum usage in CentOS