Linux中yum管理工具被误删的解决办法

今天在安装程序时，发现有一个插件未安装，我就随手敲了一个命令,看都没看

yum remove yum

然后就杯具了...

[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

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

[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

[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

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，赶紧更新一下系统吧

yum update

好了 这样yum问题就完全解决了！