软件的安装时操作系统管理的基础，与Windows不同，Linux的软件管理有很多种方式，Redhat的最常用的是RPM方式，安装集成在光盘中的RPM包。这种方式比Windows平台的软件管理更加便捷（个人感觉，总体感觉Windows程序安装于卸载有点复杂），使用起来也更加的心用手。
1、Redhat中的rpm包的位置—— 光盘目录中的 Package 目录全部都是。
2、RPM常用命令解读：
a、安装程序： rpm -ivh <软件包的绝对路径> #i为install；v，verbose；h，hash
[root@asdf /]# rpm -ivh /media/RHEL_6.1\ i386\ Disc\ 1/Packages/vsftpd-2.2.2-6.el6_0.1.i686.rpm
b、卸载程序： rpm -e <软件名>
[root@asdf /]# rpm -e vsftpd # e => erase 、uninstall
[root@asdf /]# rpm -q vsftpd #检测一下是否已卸载
package vsftpd is not installed
rpm -aq|grep yum|xargs rpm -e --nodeps #卸载所有yum相关包
c、查询指定软件是否已安装： rpm -q <软件名> / rpm -qa <软件名> / rpm -qa | grep <软件名>
[root@asdf /]# rpm -q yum # q，query
yum-3.2.29-17.el6.noarch
[root@peano /]# rpm -qa yum #这个命令没有上一个命令快
yum-3.2.29-17.el6.noarch
[root@peano /]# rpm -qa | grep yum #该命令使用管道进行正则匹配
yum-metadata-parser-1.1.2-16.el6.i686
PackageKit-yum-0.5.8-19.el6.i686
yum-utils-1.1.30-6.el6.noarch
yum-rhn-plugin-0.9.1-26.el6.noarch
PackageKit-yum-plugin-0.5.8-19.el6.i686
yum-3.2.29-17.el6.noarch
d、查询已安装软件中的某一个文件的软件包的详细名称： rpm -qf <某一文件>
[root@peano /]# rpm -qf /etc/yum.conf #qf， query file
yum-3.2.29-17.el6.noarch
e、查询已安装程序都安装在哪里： rpm -ql <程序名>
[root@asdf /]# rpm -ql yum #猜测： ql，query location
/etc/bash_completion.d
/etc/bash_completion.d/yum.bash
/etc/logrotate.d/yum
/etc/yum
/etc/yum.conf
/etc/yum.repos.d
/etc/yum/pluginconf.d
/etc/yum/protected.d
/etc/yum/vars
/etc/yum/version-groups.conf
/usr/bin/yum
/usr/lib/python2.6/site-packages/rpmUtils
/usr/lib/python2.6/site-packages/rpmUtils/__init__.py
/usr/lib/python2.6/site-packages/rpmUtils/__init__.pyc
/usr/lib/python2.6/site-packages/rpmUtils/__init__.pyo
/usr/lib/python2.6/site-packages/rpmUtils/arch.py
/usr/lib/python2.6/site-packages/rpmUtils/arch.pyc
/usr/lib/python2.6/site-packages/rpmUtils/arch.pyo
/usr/lib/python2.6/site-packages/rpmUtils/miscutils.py
/usr/lib/python2.6/site-packages/rpmUtils/miscutils.pyc
/usr/lib/python2.6/site-packages/rpmUtils/miscutils.pyo
/usr/lib/python2.6/site-packages/rpmUtils/oldUtils.py
/usr/lib/python2.6/site-packages/rpmUtils/oldUtils.pyc
/usr/lib/python2.6/site-packages/rpmUtils/oldUtils.pyo
/usr/lib/python2.6/site-packages/rpmUtils/transaction.py
/usr/lib/python2.6/site-packages/rpmUtils/transaction.pyc
/usr/lib/python2.6/site-packages/rpmUtils/transaction.pyo
---More---
f、查询已安装软件包信息： rpm -qi <软件名>
[root@asdf /]# rpm -qi yum #qi, query infomation
Name : yum Relocations: (not relocatable)
Version : 3.2.29 Vendor: Red Hat, Inc.
Release : 17.el6 Build Date: Thu 28 Apr 2011 10:43:39 AM PDT
Install Date: Mon 02 Jul 2012 02:58:17 AM PDT Build Host: x86-005.build.bos.redhat.com
Group : System Environment/Base Source RPM: yum-3.2.29-17.el6.src.rpm
Size : 4640583 License: GPLv2+
Signature : RSA/8, Fri 29 Apr 2011 06:41:01 AM PDT, Key ID 199e2f91fd431d51
Packager : Red Hat, Inc. <http://bugzilla.redhat.com/bugzilla>
URL : http://yum.baseurl.org/
Summary : RPM package installer/updater/manager
Description :
Yum is a utility that can check for and automatically download and
install updated RPM packages. Dependencies are obtained and downloaded
automatically, prompting the user for permission as necessary.
[root@asdf /]#
g、查询已安装软件的文档位置信息：rpm -qd <软件名>
[root@asdf /]# rpm -qd yum #qd， query document
/usr/share/doc/yum-3.2.29/AUTHORS
/usr/share/doc/yum-3.2.29/COPYING
/usr/share/doc/yum-3.2.29/ChangeLog
/usr/share/doc/yum-3.2.29/INSTALL
/usr/share/doc/yum-3.2.29/README
/usr/share/doc/yum-3.2.29/TODO
/usr/share/man/man5/yum.conf.5.gz
/usr/share/man/man8/yum-shell.8.gz
/usr/share/man/man8/yum.8.gz
[root@asdf /]#
h、查询已安装软件的依赖关系： rpm -qR <软件名>
[root@asdf /]# rpm -qR yum # qR ，query relation
/usr/bin/python
config(yum) = 3.2.29-17.el6
pygpgme
python >= 2.4
python(abi) = 2.6
python-iniparse
python-sqlite
python-urlgrabber >= 3.9.0-8
rpm >= 0:4.4.2
rpm-python
rpmlib(CompressedFileNames) <= 3.0.4-1
rpmlib(FileDigests) <= 4.6.0-1
rpmlib(PartialHardlinkSets) <= 4.0.4-1
rpmlib(PayloadFilesHavePrefix) <= 4.0-1
rpmlib(VersionedDependencies) <= 3.0.3-1
yum-metadata-parser >= 1.1.0
rpmlib(PayloadIsXz) <= 5.2-1
I、如果想查询未安装软件包的相关信息，可以在以上a-h的命令参数中加入一个小写的 p 即可查询相关的参数，比如h中的，查询依赖关系：
[root@asdf Packages]# rpm -qpc vsftpd-2.2.2-6.el6_0.1.i686.rpm
warning: vsftpd-2.2.2-6.el6_0.1.i686.rpm: Header V3 RSA/SHA256 Signature, key ID fd431d51: NOKEY
/etc/logrotate.d/vsftpd
/etc/pam.d/vsftpd
/etc/vsftpd/ftpusers
/etc/vsftpd/user_list
/etc/vsftpd/vsftpd.conf
[root@asdf Packages]#
J、对软件的更新操作有两种方式——rpm -Uvh 和-Fvh,两者区别在于前者在对没有安装的软件将自动安装，而后者将不安装处理；如果降级，可以采用以下命令
rpm -Uvh --oldpackage gaim-1.3.0-1.fc4.i386.rpm //新版本降级为旧版
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