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本文详细介绍了CentOS系统更新命令的使用方法，包括如何使用yum命令进行软件包的更新。通过实践操作，用户可以确保系统保持最新状态，提升系统稳定性和安全性。

本文目录导读：

1. CentOS系统更新命令概述
2. CentOS系统更新命令详解

CentOS作为一款稳定、安全、高效的Linux发行版，在企业级应用中占据着举足轻重的地位，定期更新系统是保证系统稳定性和安全性的重要手段，本文将详细介绍CentOS系统更新命令，帮助您轻松掌握系统更新的方法和技巧。

CentOS系统更新命令概述

CentOS系统更新主要依赖于Yum（Yellowdog Updater, Modified）包管理器，Yum通过互联网自动下载并更新系统软件包，确保系统始终保持最新状态，以下是常用的CentOS系统更新命令：

1、查询可更新的软件包

yum check-update

2、更新所有软件包

yum update

3、更新特定软件包

yum update 软件包名称

4、升级系统版本

yum upgrade

5、清除缓存

yum clean all

CentOS系统更新命令详解

1、查询可更新的软件包

使用yum check-update命令可以查看当前系统中可更新的软件包，命令执行后，会列出所有可更新的软件包及其版本信息，如下所示：

[root@localhost ~]# yum check-update
Loaded plugins: fastestmirror
Loading mirror speeds from cached hostfile
 * base: mirrors.aliyun.com
 * extras: mirrors.aliyun.com
 * updates: mirrors.aliyun.com
No packages marked for update

2、更新所有软件包

使用yum update命令可以更新系统中所有可更新的软件包，命令执行过程中，会自动下载并安装最新的软件包，同时保留原有的配置文件，如下所示：

[root@localhost ~]# yum update
Loaded plugins: fastestmirror
Loading mirror speeds from cached hostfile
 * base: mirrors.aliyun.com
 * extras: mirrors.aliyun.com
 * updates: mirrors.aliyun.com
Resolving Dependencies
--> Running transaction check
--- Package python-2.7.5-88.el7.x86_64 updating from 2.7.5-88.el7 to 2.7.5-89.el7.x86_64
--> Processing Dependency: python = 2.7.5-88.el7 for package: python-2.7.5-88.el7.x86_64

Transaction check succeeded, running transaction test
Running transaction test
The test transaction set was empty.
Warning: No enabled repositories.
Cleaning up...
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本文标签属性：

CentOS更新命令：centos update

系统维护实践：系统维护的工作

CentOS系统更新命令：centos 更新