This wiki page is about a path or a file in the Linux file system. Be bold and improve it! Describe its purpose and its use, which program created it and uses it, which configuration settings it might be dependent on, and which Linux distributions typically have this file by default while others might not.
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/var/lib/portage/ $ ls -1
The most important file is
world, which preserves the list of your favourite packages, those you have explicitly installed.