摘要：一命令全稱為是一個(gè)在和以及中的前端軟件包管理器。提供了查找安裝刪除某一個(gè)一組甚至全部軟件包的命令，而且命令簡(jiǎn)潔而又好記。

一、yum命令

yum（全稱為 Yellow dog Updater Modified）是一個(gè)在Fedora和RedHat以及SUSE中的Shell前端軟件包管理器?；禦PM包管理，能夠從指定的服務(wù)器自動(dòng)下載RPM包并且安裝，可以自動(dòng)處理依賴性關(guān)系，并且一次安裝所有依賴的軟體包，無(wú)須繁瑣地一次次下載、安裝。yum提供了查找、安裝、刪除某一個(gè)、一組甚至全部軟件包的命令，而且命令簡(jiǎn)潔而又好記。
1.1 語(yǔ)法

yum [options] [command] [package ...]

1.2 選項(xiàng)

二、示列
實(shí)例 1
安裝 pam-devel

[root@www ~]# yum install pam-devel
Setting up Install Process
Parsing package install arguments
Resolving Dependencies  <==先檢查軟件的屬性相依問(wèn)題
--> Running transaction check
---> Package pam-devel.i386 0:0.99.6.2-4.el5 set to be updated
--> Processing Dependency: pam = 0.99.6.2-4.el5 for package: pam-devel
--> Running transaction check
---> Package pam.i386 0:0.99.6.2-4.el5 set to be updated
filelists.xml.gz          100% |=========================| 1.6 MB    00:05
filelists.xml.gz          100% |=========================| 138 kB    00:00
-> Finished Dependency Resolution
……(省略)

實(shí)例 2
移除 pam-devel

[root@www ~]# yum remove pam-devel
Setting up Remove Process
Resolving Dependencies  <==同樣的，先解決屬性相依的問(wèn)題
--> Running transaction check
---> Package pam-devel.i386 0:0.99.6.2-4.el5 set to be erased
--> Finished Dependency Resolution

Dependencies Resolved

=============================================================================
 Package                 Arch       Version          Repository        Size
=============================================================================
Removing:
 pam-devel               i386       0.99.6.2-4.el5   installed         495 k

Transaction Summary
=============================================================================
Install      0 Package(s)
Update       0 Package(s)
Remove       1 Package(s)  <==還好，并沒(méi)有屬性相依的問(wèn)題，單純移除一個(gè)軟件

Is this ok [y/N]: y
Downloading Packages:
Running rpm_check_debug
Running Transaction Test
Finished Transaction Test
Transaction Test Succeeded
Running Transaction
  Erasing   : pam-devel                    ######################### [1/1]

Removed: pam-devel.i386 0:0.99.6.2-4.el5
Complete!

實(shí)例 3
利用 yum 的功能，找出以 pam 為開(kāi)頭的軟件名稱有哪些？

[root@www ~]# yum list pam*
Installed Packages
pam.i386                  0.99.6.2-3.27.el5      installed
pam_ccreds.i386           3-5                    installed
pam_krb5.i386             2.2.14-1               installed
pam_passwdqc.i386         1.0.2-1.2.2            installed
pam_pkcs11.i386           0.5.3-23               installed
pam_smb.i386              1.1.7-7.2.1            installed
Available Packages <==底下則是『可升級(jí)』的或『未安裝』的
pam.i386                  0.99.6.2-4.el5         base
pam-devel.i386            0.99.6.2-4.el5         base
pam_krb5.i386             2.2.14-10              base