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apt-mark:tldr:914fb
The command "apt-mark showmanual" is used in Ubuntu-based operating systems to display a list of manually installed packages.
In Ubuntu's package management system, when a package is installed, it can either be marked as manually installed or automatically installed. Manually installed packages are those that were intentionally selected and installed by the user, while automatically installed packages are dependencies of other packages and were installed automatically.
The "apt-mark showmanual" command displays only the packages that were marked as manually installed. This can be useful for various reasons, such as identifying which packages were deliberately installed by the user, or for troubleshooting purposes when trying to determine which packages can be removed without affecting other software dependencies.