see also Gentoo wiki article from my old wiki

• Handbook
• Working with Gentoo - A Portage Introduction, USE Flags, Portage Features, Initscripts, Environment Variables
• Gentoo Linux Wiki and Gentoo Linux Wiki German
• Lokalisierung (Gentoo Wiki) and Gentoo Linux: Anleitung zur deutschen Lokalisierung)
• Gentoo maintenance
• ATI
  • http://www.gentoo.org/doc/en/ati-faq.xml
  • http://de.gentoo-wiki.com/wiki/Grafikkarten#AMD.2FATI
  • http://de.gentoo-wiki.com/wiki/Radeon
• Wireless configuration

# list and read eselect news
eselect news list
eselect news read <item>
 
# list and set gentoo profiles
eselect profile list
eselect profile set <profile-num>
# Example location for a profile: /usr/portage/profiles/targets/desktop/gnome/
 
# list runlevels-config
rc-config list
 
# add daemon/service to runlevel (e.g. default)
rc-update add sshd default
 
# emerge *temporarily* with other use-flags
USE="-X" emerge -va vim
 
# enable bash-completion for e.g. vim (globally)
eselect bashcomp enable --global vim
 
# emerge package without adding to world
emerge -1 <atom>      # -1 is alias for --oneshot
 
# add already installed package to world-file without re-emerging it
emerge --noreplace <atom>
 
# remove package from world-file without unmerging it
emerge --deselect <atom>
 
# clean distfiles (instead of doing "rm /usr/portage/distfiles/*")
eclean distfiles

emerge --update --deep --with-bdeps=y --newuse world

emerge -va app-portage/eix

Update index

eix-sync

Simple search

eix holdingnuts

emerge -va app-portage/gentoolkit   # -> equery

::

Show reverse dependencies of package:

qdepends -Q misc-foo/bar

Alternatively use --tree on emerge.

• http://de.gentoo-wiki.com/wiki/USE_Flag

# world file
/var/lib/portage/world
 
# package specific use flags
/etc/portage/package.use

• /etc/portage/package.accept_keywords replaces /etc/portage/package.keywords
• dispatch-conf is preferred over etc-update

http://en.gentoo-wiki.com/wiki/Gentoo_maintenance

• fix_libtool_files.sh on gcc-upgrade #http://www.gentoo.org/doc/en/gcc-upgrading.xml (not needed anymore!)
• gcc-config <version> changes the current cc/gcc profile
• eselect python set <slot> plus python-updater on python major upgrade
• revdep-rebuild finds broken dependencies and reemerges the packages which rely on them
• lafilefixer --justfixit fixes .la libtool archives to list libraries
• portage:
  • emaint --check world and emaint --fix world
  • less /var/log/portage/elog for reading emerge.log (or use GUI-tool app-portage/elogviewer [untested])
  • eix-test-obsolete tests for redundancy and errors in /etc/portage
• module-rebuild, module-rebuild populate and module-rebuild rebuild (emerge -av sys-kernel/module-rebuild)