Listing installed packages
If you've got the gentoo utility package installed, you can
useequery to search installed packages. It
supports wild cards, e.g.:
$ equery l *emacs*
Listing all files belonging to an installed package
This is the equivalent of what we on Debian based systems
would dodpkg -L <package> for:
$ equery f dev-java/jdbc-mysql
Configuration files for the init.d scripts
Debian systems use the/etc/default directory structure for
providing configuration for the init.d scripts. However, in
Gentoo, I've found /etc/conf.d to provide the same feature.
Hence, to find the configuration for varnish, you'd have to look
in/etc/conf.d/varnishd on Gentoo instead of
/etc/default/varnish as you would on Debian systems. Also note
that Gentoo adds the d as in daemon to the
file and variables.