linux输入yum后提示： -bash: /usr/bin/yum: No such file or directory的...

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linux输入yum后提示： -bash: /usr/bin/yum: No such file or directory的解决方案
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...

1  [iyunv@localhost ~]# yum
2  -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

1  rpm -ivh  --nodeps http://mirrors.163.com/centos/5/ ... centos.1.noarch.rpm  
2  rpm -ivh  --nodeps http://mirrors.163.com/centos/5/ ... 5.centos.x86_64.rpm  
3  rpm -ivh  --nodeps http://mirrors.163.com/centos/5/ ... 5.centos.noarch.rpm
关于rpm --nodeps的解释

1 --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
[iyunv@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:
http://wiki.linux.duke.edu/YumFaq

因为yum调用的是python,运行 Python，试下是否可行
[iyunv@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 http://mirrors.163.com/centos/5/ ... -2.1.2.8.x86_64.rpm
再次测试运行下yum命令，结果正常了，大喜

[iyunv@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

1 yum update
好了 这样yum问题就完全解决了！