yum: No such file or directory after typing yum in linux

After entering yum in linux, the prompt: -bash: /usr/bin/yum: No such file or directory solution

When I was installing the program today, I found that a plug-in was not installed, so I typed a command without even looking at it.

yum remove yum

Then the cup...

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

This careless mistake did not bring down the entire system, but it did make yum unusable. So, I tried tossing it

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

Explanation of rpm --nodeps

--nodeps don't verify package dependencies

Next, try to enter yum again, and an inexplicable error occurs again

[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 
 The current version of Python 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

Because yum calls python, run Python and try to see if it works.

[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 
 >>>

It says libxml2.so.2 is missing. Try installing it.

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

Test and run the yum command again, the result is normal, I am very happy

[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:

Finally, update the system quickly.