How To Determine What Packages Are Installed on a System

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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

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