Answer by Tamara Wijsman for Manage multiple world files in gentoo linux for...
/etc/portage/sets/* and /var/lib/portage/world_sets can be used to accomplish this. Read more about it in man portage.
View ArticleManage multiple world files in gentoo linux for different machines
If a user selects a package to be installed gentoo adds it to /var/lib/portage/world. Hence it can be used to install the same software on many systems by copying this file and run # emerge -uDN world...
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