今天在安装程序时，发现有一个插件未安装，随手敲了一个命令,看都没看

代码如下:

yum remove yum

然后就杯具了...

代码如下:

[root@localhost ~]# yum 

-bash: /usr/bin/yum: No such file or directory

 

这个粗心的手误倒不至于让整个系统瘫痪，yum 却无法使用了。于是，我试着折腾了一番

代码如下:

rpm -ivh --nodeps <a href="http://mirrors.163.com/centos/5/os/x86_64/CentOS/yum-fastestmirror-1.1.16-14.el5.centos.1.noarch.rpm">http://mirrors.163.com/centos/5/os/x86_64/CentOS/yum-fastestmirror-1.1.16-14.el5.centos.1.noarch.rpm</a> 

rpm -ivh --nodeps <a href="http://mirrors.163.com/centos/5/os/x86_64/CentOS/yum-metadata-parser-1.1.2-3.el5.centos.x86_64.rpm">http://mirrors.163.com/centos/5/os/x86_64/CentOS/yum-metadata-parser-1.1.2-3.el5.centos.x86_64.rpm</a> 

rpm -ivh --nodeps <a href="http://mirrors.163.com/centos/5/os/x86_64/CentOS/yum-3.2.22-26.el5.centos.noarch.rpm[/code">http://mirrors.163.com/centos/5/os/x86_64/CentOS/yum-3.2.22-26.el5.centos.noarch.rpm[/code</a>]

关于rpm --nodeps的解释

[code]

--nodeps don't verify package dependencies

接下来，再次尝试输入yum,结果再次出现莫名错误

代码如下:

[root@localhost ~]# yum 

There was a problem importing one of the Python modules 

required to run yum. The error leading to this problem was: 

libxml2.so.2: cannot open shared object file: No such file or directory 

Please install a package which provides this module, or 

verify that the module is installed correctly. 

It's possible that the above module doesn't match the 

current version of Python, which is: 

2.4.3 (#1, Nov 11 2010, 13:30:19) 

[GCC 4.1.2 20080704 (Red Hat 4.1.2-48)] 

If you cannot solve this problem yourself, please go to 

the yum faq at: 

<a href="http://wiki.linux.duke.edu/YumFaq">http://wiki.linux.duke.edu/YumFaq</a> 

因为yum调用的是python,运行 Python，试下是否可行

代码如下:

[root@localhost~]# python 

Python 2.4.3 (#1, Nov 11 2010, 13:30:19) 

[GCC 4.1.2 20080704 Red Hat 4.1.2-48)] on linux2 

Type "help", "copyright", "credits" or "license" for more information. 

>>> import yum 

Traceback (most recent call last): 

File "<stdin>", line 1, in ? 

File "/usr/lib/python2.4/site-packages/yum/__init__.py", line 54, in ? 

import transactioninfo 

File "/usr/lib/python2.4/site-packages/yum/transactioninfo.py", line 31, in ? 

from sqlitesack import YumAvailablePackageSqlite 

File "/usr/lib/python2.4/site-packages/yum/sqlitesack.py", line 26, in ? 

import yumRepo 

File "/usr/lib/python2.4/site-packages/yum/yumRepo.py", line 32, in ? 

import sqlitecachec 

File "/usr/lib64/python2.4/site-packages/sqlitecachec.py", line 19, in ? 

import _sqlitecache 

ImportError: libxml2.so.2: cannot open shared object file: No such file or directory 

>>> 

提示缺少libxml2.so.2，安装一下试试

代码如下:

rpm -ivh <a href="http://mirrors.163.com/centos/5/os/x86_64/CentOS/libxml2-2.6.26-2.1.2.8.x86_64.rpm[/code">http://mirrors.163.com/centos/5/os/x86_64/CentOS/libxml2-2.6.26-2.1.2.8.x86_64.rpm[/code</a>]

再次测试运行下yum命令，结果正常了，大喜

[code]

[root@localhost ~]# yum 

Loaded plugins: fastestmirror 

You need to give some command 

usage: yum [options] COMMAND 

List of Commands: 

check-update Check for available package updates 

clean Remove cached data 

deplist List a package's dependencies 

downgrade downgrade a package 

erase Remove a package or packages from your system 

groupinfo Display details about a package group 

groupinstall Install the packages in a group on your system 

grouplist List available package groups 

groupremove Remove the packages in a group from your system 

help Display a helpful usage message 

info Display details about a package or group of packages 

install Install a package or packages on your system 

list List a package or groups of packages 

localinstall Install a local RPM 

makecache Generate the metadata cache 

provides Find what package provides the given value 

reinstall reinstall a package 

repolist Display the configured software repositories 

resolvedep Determine which package provides the given dependency 

search Search package details for the given string 

shell Run an interactive yum shell 

update Update a package or packages on your system 

upgrade Update packages taking obsoletes into account 

options: 

-h, --help show this help message and exit 

-t, --tolerant be tolerant of errors 

-C run entirely from cache, don't update cache 

-c [config file] config file location 

-R [minutes] maximum command wait time 

-d [debug level] debugging output level 

--showduplicates show duplicates, in repos, in list/search commands 

-e [error level] error output level 

-q, --quiet quiet operation 

-v, --verbose verbose operation 

-y answer yes for all questions 

--version show Yum version and exit 

--installroot=[path] set install root 

--enablerepo=[repo] enable one or more repositories (wildcards allowed) 

--disablerepo=[repo] disable one or more repositories (wildcards allowed) 

-x [package], --exclude=[package] 

exclude package(s) by name or glob 

--disableexcludes=[repo] 

disable exclude from main, for a repo or for 

everything 

--obsoletes enable obsoletes processing during updates 

--noplugins disable Yum plugins 

--nogpgcheck disable gpg signature checking 

--disableplugin=[plugin] 

disable plugins by name 

--enableplugin=[plugin] 

enable plugins by name 

--skip-broken skip packages with depsolving problems 

--color=COLOR control whether color is used 

Plugin Options: 

最后，更新一下系统吧

代码如下:

yum update

好了 这样yum问题就完全解决了！

关键字：Linux、yum、管理工具