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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".