emerge -av programname ## Install programname. Verbose confirmation prompt.
emerge -C programname ## Uninstall programname.
emerge -s keyword ## Look for all ebuilds (build-scripts) that contain keyword.
emerge sync ## Updates the (huge) portage tree (all ebuilds).
emerge -uDav world ## Updates all packages. Verbose confirmation prompt.
etc-update ## Launches an interactive program for updating the configuration files.

rc-update add servicename default ## Always load servicename in the default runlevel.
rc-update del servicename runlevelname ## Stop loading servicename in runlevelname.
rc-update show ## Lists all services and where/whether they are loaded.