http://www.gentoo.org/doc/en/gentoo-upgrading.xml
Updating your System
To keep your system in perfect shape (and not to mention install the latest security updates) you need to update your system regularly. Since Portage only checks the ebuilds in your Portage tree you first have to update your Portage tree. When your Portage tree is updated, you can update your system with emerge --update world. In the next example, we'll also use the --ask switch which will tell Portage to display the list of packages it wants to upgrade and ask you if you want to continue:
Code Listing 13: Updating your system |
# emerge --update --ask world |
Portage will then search for newer version of the applications you have installed. However, it will only verify the versions for the applications you have explicitly installed - not the dependencies. If you want to update every single package on your system, add the --deep argument:
Code Listing 14: Updating your entire system |
# emerge --update --deep world |
Since security updates also happen in packages you have not explicitly installed on your system (but that are pulled in as dependencies of other programs), it is recommended to run this command once in a while.
If you have altered any of your USE flags lately you might want to add --newuse as well. Portage will then verify if the change requires the installation of new packages or recompilation of existing ones:
Code Listing 15: Performing a full update |
# emerge --update --deep --newuse world |
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