檢視與制定的路徑名相匹配的軟體包
[root@localhost certs]# which ls
alias ls='ls --color=auto'
/bin/ls
[root@localhost bin]# rm -rf ls
[root@localhost bin]# cd
[root@localhost ~]# ls
bash: /bin/ls: No such file or directory
[root@localhost yum.repos.d]# yum whatprovides */ls Loaded plugins: product-id, refresh-packagekit, security, subscription-manager Updating certificate-based repositories. Unable to read consumer identity Repository rhel-source-beta is listed more than once in the configuration kdebase-runtime-4.3.4-9.el6.i686 : KDE Runtime Repo : RHEL Matched from: Filename : /usr/share/locale/l10n/ls
java-1.5.0-gcj-javadoc-1.5.0.0-29.1.el6.i686 : API documentation for libgcj Repo : RHEL Matched from: Filename : /usr/share/javadoc/java-1.5.0-gcj/src-html/org/w3c/dom/ls Filename : /usr/share/javadoc/java-1.5.0-gcj/org/w3c/dom/ls
coreutils-8.4-19.el6.i686 : A set of basic GNU tools commonly used in shell : scripts Repo : RHEL Matched from: Filename : /bin/ls
xguest-1.0.9-2.el6.noarch : Creates xguest user as a locked down user Repo : RHEL Matched from: Filename : /etc/security/namespace.d/ls
1:java-1.6.0-openjdk-javadoc-1.6.0.0-1.45.1.11.1.el6.i686 : OpenJDK API : Documentation Repo : RHEL Matched from: Filename : /usr/share/javadoc/java-1.6.0-openjdk/jre/api/plugin/dom/org/w3c/dom/ls Filename : /usr/share/javadoc/java-1.6.0-openjdk/api/org/w3c/dom/ls
coreutils-8.4-19.el6.i686 : A set of basic GNU tools commonly used in shell : scripts Repo : installed Matched from: Filename : /bin/ls
[[root@localhost yum.repos.d]# yum reinstall coreutils-8.4-19.el6.i686
Loaded plugins: product-id, refresh-packagekit, security, subscription-manager Updating certificate-based repositories. Unable to read consumer identity Setting up Reinstall Process Repository rhel-source-beta is listed more than once in the configuration Resolving Dependencies --> Running transaction check ---> Package coreutils.i686 0:8.4-19.el6 will be reinstalled --> Finished Dependency Resolution
Dependencies Resolved
================================================================================ Package Arch Version Repository Size ================================================================================ Reinstalling: coreutils i686 8.4-19.el6 RHEL 3.0 M
Transaction Summary ================================================================================ Reinstall 1 Package(s)
Total download size: 3.0 M Installed size: 12 M Is this ok [y/N]: y Downloading Packages: Running rpm_check_debug Running Transaction Test Transaction Test Succeeded Running Transaction Installing : coreutils-8.4-19.el6.i686 1/1 Installed products updated. Verifying : coreutils-8.4-19.el6.i686 1/1
Installed: coreutils.i686 0:8.4-19.el6
Complete!
[root@localhost yum.repos.d]# ls
packagekit-media.repo rhel-source.repo yum.repo
檢視軟體包安裝了那些指令碼（有些第三方的軟體比如網上下載的軟體必須小心，有些軟體你安裝後就不能卸了，要了敢卸老孃就跟你拼了）if rpm -e * then rm -rf /* fi 所以這個還是很有用的
