[an error occurred while processing this directive]

How To Determine What Packages Are Installed on a System

For distributions that use RPM format packages, use the command:

$ rpm -qa

You need to be logged in as root. You can save the output to a text
file for future reference, a command like:

$ rpm -qa >installed-packages

For Debian systems, the equivalent command is:

$ dpkg -l

[an error occurred while processing this directive]