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Check the installed RPM packages.Red Hat Enterprise Linux and CentOS, which was developed based on Red Hat Enterprise Linux, use a package management tool called RPM (Redhat Package Manager).。RPM is a handy management tool that allows you to easily install and uninstall software and manage RPM packages with dependencies in mind, preventing you from accidentally removing RPM packages that you need.If you want to use this RPM, use the "rpm" command.Use the "-q" option to examine the RPM packages already installed, and the "-a" option to list the installed packages.rpm -qa" alone will show you all the packages installed on your Linux system, and is not suitable for checking specific packages.It is not suitable for checking a specific package.To check if a specific package is installed, specify the PRM package you want to check in "rpm -qa".

Display RPM package informationTo find out what features a particular package provides, use the -q option to make a query, and the -i sub-option in combination to display that information.Specify the package name of the package for which you want to display information as an argument.

Display the directory where the RPM package is installed.To find out where the relevant files are when you install a particular package, run the rpm command with theTo check where the related files are located after installing a particular package, run the rpm command with the "-ql" option. Specify the package name as an argument.

Test the installation of RPM packages.Sometimes, due to dependencies, conflicts, or other problems, an error message will be displayed when executing the install command and the installation will fail.It is possible to test for such problems before installation.To do so, run the rpm command with the "--test" option and execute the installation.[root@Lion ~]# rpm -ivh --test zlib-devel-1.2.3-4vl5.i386.rpm↑Test the installation of the rpm package

Show RPM dependent packagesDependencies are often a problem when manipulating packages, such as installing, upgrading, or removing RPM packages.So to avoid these problems, it is important to check the dependencies in advance.To check what package a particular package depends on, run the rpm command with the "-q" option in combination with the "-R" option to display the name of the dependent package.

Install the RPM packageTo install the rpm package, run the r...

Package management with YUMCentOS and Fedora have YUM (Yello...

Import the public keyWhen installing a package with the rpm ...

RPM Database●Rebuild the RPM database.Information about RPM packages is stored in the RPM database.When searching for information about a package, this RPM database plays an important role, but sometimes it gets corrupted.In such a case, the RPM database can be rebuilt by running the rpm command with the "--rebuilddb" option.[root@Lion ~]# rpm --rebuilddb[root@Lion ~]#●Create a new RPM package database.To create a new RPM package database, run the rpm command with the "--initdb" option.