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

  yum remove yum

  [root@localhost ~]# yum   -bash: /usr/bin/yum: No such file or directory 

  rpm -ivh --nodeps http://mirrors.163.com/centos/5/os/x86_64/CentOS/yum-fastestmirror-1.1.16-14.el5.centos.1.noarch.rpm   rpm -ivh --nodeps http://mirrors.163.com/centos/5/os/x86_64/CentOS/yum-metadata-parser-1.1.2-3.el5.centos.x86_64.rpm   rpm -ivh --nodeps http://mirrors.163.com/centos/5/os/x86_64/CentOS/yum-3.2.22-26.el5.centos.noarch.rpm

  --nodeps             don't verify package dependencies 

  [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:    http://wiki.linux.duke.edu/YumFaq

  [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    >>>

  rpm -ivh http://mirrors.163.com/centos/5/os/x86_64/CentOS/libxml2-2.6.26-2.1.2.8.x86_64.rpm

  [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:

  yum update