Update Gentoo

To update the ports enter:

emerge --sync

or if a firewall blacks you enter:

emerge-webrsync

To display packages which need an update enter:

emerge --pretend --verbose world

To update all packages where the USE-FLAG has changed:

emerge --update --deep --newuse world

To update the complete system enter:

emerge --update --deep world

To Update the /etc directory

etc-update

To update dependency execute:

revdep-rebuild