(Yellowdog Updater Modified)是一个集与查找，安装，更新和删除程序的Linux软件。它运行在RPM包兼容的发行版本上，如：, Fedora, SUSE, , Mandriva。

今天我在用CentOS 5.5的yum命令安装的时候出现如下错误：

[root@malu2 ~]# yum install vim

Loaded plugins: fastestmirror

Loading mirror speeds from cached hostfile

* base: mirror.hosting90.cz

* extras: mirror.hosting90.cz

* updates: mirror.hosting90.cz

Setting up Install Process

No package vim available.

Nothing to do

 

对于此错误，我一般习惯性先去更新一下yum仓库：

#yum -y update

再次运行安装，发现错误依旧，看来这种猜包名的方法不适用；所以接下来可以通过yum的查找参数来列出相关的包名:

[root@malu2 yum.repos.d]# yum search vim

Loaded plugins: fastestmirror

Loading mirror speeds from cached hostfile

* base: mirror.hosting90.cz

* extras: mirror.hosting90.cz

* updates: mirror.hosting90.cz

===================== Matched: vim ===================

vim-X11.x86_64 : The VIM version of the vi editor for the X Window System.

vim-common.x86_64 : The common files needed by any version of the VIM editor.

vim-enhanced.x86_64 : A version of the VIM editor which includes recent

: enhancements.

vim-minimal.x86_64 : A minimal version of the VIM editor.

 

通过查看，我们可以看到，yum列出了详细的vim相关的包名，这样就可以顺利的安装vim了：

#yum -y install vim-enhanced.x86_64

以上命令就能执行成功了。当然不仅仅vim安装，其他程序比如mysql我们也同样只要先进行yum查找，再通过匹配详细包名来进行安装，就不会出现上述错误了

Yum的更新及安装操作

更新及安装：yum install package 安装指定的安装包packageyum localinstall package 本地安装软件包yum update 全部更新 yum update package 更新指定程序包package yum check-update 检查可更新的程序查找和显示yum info 
    
      显示安装包信息 yum list 显示所有已经安装和可以安装的程序包 yum list 
     
       显示指定程序包安装情况 yum search 
      
       查找软件包
      
     
    

Yum和Apt-get对比

Task	Red Hat/Fedora	Ubuntu/Debian
Adding, Removing and Upgrading Packages
Refresh list of available packages	Yum refreshes each time it’s used	apt-get update
Install a package from a repository	yum installpackage_name	apt-get installpackage_name
Install a package file	yum installpackage.rpmrpm -ipackage.rpm	dpkg –install package.deb
Remove a package	rpm -e package_name	apt-get removepackage_name
Check for package upgrades	yum check-update	apt-get -s upgradeapt-get -s dist-upgrade
Upgrade packages	yum updaterpm -Uvh [args]	apt-get dist-upgrade
Upgrade the entire system	yum upgrade	apt-get dist-upgrade
Package Information
Get information about an available package	yum searchpackage_name	apt-cache searchpackage_name
Show available packages	yum list available	apt-cache dumpavail
List all installed packages	yum list installedrpm -qa	dpkg –list
Get information about a package	yum info package_name	apt-cache showpackage_name
Get information about an installed package	rpm -qi package_name	dpkg –statuspackage_name
List files in an installed package	rpm -ql package_name	dpkg –listfilespackage_name
List documentation files in an installed package	rpm -qd package_name	-
List configuration files in an installed package	rpm -qc package_name	-
Show the packages a given package depends on	rpm -qR package_name	apt-cache depends
Show other packages that depend on agiven package (reverse dependency)	rpm -q -whatrequires [args]	apt-cache rdepends
Package File Information
Get information about a package file	rpm -qpi package.rpm	dpkg –info package.deb
List files in a package file	rpm -qpl package.rpm	dpkg –contentspackage.deb
List documentation files in a package file	rpm -qpd package.rpm	-
List configuration files in a package file	rpm -qpc package.rpm	-
Extract files in a package	rpm2cpio package.rpm | cpio -vid	dpkg-deb –extractpackage.deb dir-to-extract-to
Find package that installed a file	rpm -qf filename	dpkg –search filename
Find package that provides a particular file	yum provides filename	apt-file search filename
Misc. Packaging System Tools
Show stats about the package cache	-	apt-cache stats
Verify all installed packages	rpm -Va	debsums
Remove packages from the local cache directory	yum clean packages	apt-get clean
Remove only obsolete packages from the local cache directory	-	apt-get autoclean
Remove header files from the local cache directory(forcing a new download of same on next use)	yum clean headers	apt-file purge
General Packaging System Information
Package file extension	.rpm	.deb
Repository location configuration	/etc/yum.conf	/etc/apt/sources.list