When used as arguments to emerge sets have to be prefixed with @ to be recognized.
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system refers to a set of packages deemed necessary for your system to run properly.
world encompasses both the selected and system sets.
Also note that depclean may break link level dependencies, especially when the --depclean-lib-check option is disabled.
Thus, it is recommended to use a tool such as revdep-rebuild(1) in order to detect such breakage.
See the portageq(1) owners command if you would like to query the owners of one or more files or directories.
set A is a convenient shorthand for a large group of packages.
Packages installed, but not part of the dependency tree, will be uninstalled by depclean.
See --with-bdeps for behavior with respect to build time dependencies that are not strictly required.
If an absolute path is not used, then it must begin with either "./" or "../".