Gentoo
Checking for Vulnerabilities
To check installed ebuilds against known vulnerabilities, first make sure app-portage/gentoolkit is installed, then use the following command:
glsa-check -l affected
Fixing Broken Dependencies
revdep-rebuild --ignore --pretend revdep-rebuild -i -p -v
Building Packages
quickpkg
Finding what ebuild a File Belongs To
equery belongs file
Backup an Ebuild
Use quickpkg
Generate a New Manifest for a Crudely Hacked Ebuild
ebuild /usr/local/portage/net-irc/xchat/xchat-2.0.9.ebuild digest
Changing Portage Profile
eselect profile list eselect profile set <number>
Unmask Package
Add a line to /etc/portage/package.keywords like so:
net-mail/qmrtg ~amd64
Customize an ebuild =
http://gentoo-wiki.com/HOWTO_Create_an_Updated_Ebuild#Unmasking_the_ebuild