eselect
Gentoo's multi-purpose configuration and management tool. It consists of various modules that take care of individual administrative tasks. Some subcommands such as `kernel`, `locale`, `profile`, etc. have their own usage documentation.
More info →Subcommands (5)
An `eselect` module for managing the `/usr/src/linux` symlink.
An `eselect` module for managing the `$LANG` environment variable, which sets the system language.
An `eselect` module for reading Gentoo news items. Note: Portage will print a notice when a repository is synchronized and there are unread news items.
An `eselect` module for managing the `/etc/portage/make.profile` symlink, which sets the system profile.
An `eselect` module for configuring ebuild repositories for Portage. After enabling a repository, you have to run `emerge --sync repo_name` to download ebuilds.