Egencache

egencache is a software tool that rebuilds metadata information for the Portage tree.

Metadata for the Portage tree comes included in Portage tarballs and can be re-downloaded with, but will not be downloaded when using cvs checkout as the Portage sync method.

Installation
Since every Gentoo install comes with Portage by default, every system will also have installed. Run a quick test by issuing the the  option as seen in the usage section below. If usage instructions are not displayed to the terminal there is certainly a problem. It is possible install Portage by following the installation instructions.

Rebuilding the metadata cache
In order to rebuild the metadata cache on a system you can issue this command:

Adjust the number of jobs to be appropriate to each system. The "safe" metric to use with jobs will depend on the processor and system load. In the example above  jobs are used as an example.