紅樓隔雨相望冷，珠箔飄燈獨自歸。 ——李商隱《春雨》

準備安裝跑火車的指令，但是卻報錯，這個原因是缺少EPEL，先下載EPEL：

wget http://dl.fedoraproject.org/pub/epel/6/x86_64/epel-release-6-8.noarch.rpm

解壓安裝：

[root@bogon day-0803]# rpm -ivh epel-release-6-8.noarch.rpm 
warning: epel-release-6-8.noarch.rpm: Header V3 RSA/SHA256 Signature, key ID 0608b895: NOKEY
Preparing...                ########################################### [100%]
 

   1:epel-release           ########################################### [100%]
[root@bogon day-0803]# yum install sl
Loaded plugins: fastestmirror, refresh-packagekit, security
Loading mirror speeds from cached hostfile
epel/metalink                                                                    | 7.6
 
 kB     00:00     
 * base: mirrors.aliyun.com
 * epel: mirrors.aliyun.com
 * extras: mirrors.aliyun.com
 * updates: mirrors.aliyun.com
epel                                                                             | 3.2 kB     00:00     
epel/primary                                                                     | 2.9
 
 MB     00:01     
epel                                                                                        10197/10197
Setting up Install Process
Resolving Dependencies
--> Running transaction check
---> Package sl.i686 0:5.02-1.el6 will be installed
--> Finished Dependency Resolution

Dependencies Resolved

========================================================================================================
 Package              Arch                   Version                       Repository              Size
========================================================================================================
Installing:
 sl                   i686                   5.02-1.el6                    epel                    13 k

Transaction Summary
========================================================================================================
Install       1 Package(s)

Total download size: 13 k
Installed size: 13 k
Is this ok [y/N]: y
Downloading Packages:
sl-5.02-1.el6.i686.rpm                                                           |  13 kB     00:00     
warning: rpmts_HdrFromFdno: Header V3 RSA/SHA256 Signature, key ID 0608b895: NOKEY
Retrieving key from file:///etc/pki/rpm-gpg/RPM-GPG-KEY-EPEL-6
Importing GPG key 0x0608B895:
 Userid : EPEL (6) <epel@fedoraproject.org>
 Package: epel-release-6-8.noarch (installed)
 From   : /etc/pki/rpm-gpg/RPM-GPG-KEY-EPEL-6
Is this ok [y/N]: y
Running rpm_check_debug
Running Transaction Test
Transaction Test Succeeded
Running Transaction
Warning: RPMDB altered outside of yum.
  Installing : sl-5.02-1.el6.i686                                                                   1/1 
  Verifying  : sl-5.02-1.el6.i686                                                                   1/1 

Installed:
  sl.i686 0:5.02-1.el6                                                                                  

Complete!

到此，執行sl指令就能看到一個火車跑過了。