Verifying Installed Packages
Over the course of a system’s normal usage, files get changed. This could be as innocent as simply changing a configuration file in the /etc directory or as problematic as a file being corrupted by a power failure. To assist in the detection of these changes, RPM allows users and administrators to verify the integrity of an installed package.
The command
or
Will verify all installed packages. RPM then computes the MD5 checksum of all files on the disk and compares them to the stored MD5 sums from the original RPMs. The output of the command is a line indicating any files that differ from the versions that were originally installed and a code indicating how the file has changed.
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