rpm:tldr:2755a

The command "rpm --query --all '${mariadb*}'" is used to query the RPM database for all packages that have names starting with "mariadb".

Here is the breakdown of each component of the command:

• "rpm" is the package manager command used to interact with RPM packages.
• "--query" or "-q" is an option used to query the RPM database.
• "--all" or "-a" is an option used to specify that the query should be performed on all installed packages.
• "'${mariadb}'" is the query string, where '${mariadb}' is a wildcard pattern that matches any package name starting with "mariadb". The wildcard '*' represents any number of characters.

By executing this command, the RPM database will be queried, and a list of all installed packages that have names starting with "mariadb" will be displayed.