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Gentoo Cheat Sheet

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This is a reference card of useful commands for administrating Gentoo.

Portage Package Management

Sync the Portage tree using the mirrors by fetching the latest differences:

root # emerge --sync

Sync the Portage tree using the mirrors by obtaining a Portage snapshot that is at most a day old:

root # emerge-webrsync

Sync the overlay and Portage tree using eix:

root # eix-sync

List what packages would be installed without installing them:

root # emerge -pv cat/pkg

Install a specific version of a package:

root # emerge =cat/pkg-1.0

Remove a package and the dependencies that no other packages depend on:

root # emerge -cav cat/pkg

Remove a package but not its dependencies:

root # emerge -C cat/pkg

Check for and rebuild missing libraries

root # revdep-rebuild -v

Remove no longer needed packages:

root # emerge -av --depclean

Upgrade the selected packages, dependencies and deep dependencies that are outdated or have USE flag changes:

root # emerge -uDN world

equery is a collection of modules for querying the state of Gentoo packages, files and USE flags.

root # man equery

Tell which installed package provides a command.

user $ equery b `which vim`

Tell which packages depend on cat/pkg:

user $ equery d cat/pkg

Get information about a package using eix:

root # eix cat/pkg

A graphical user interface to use with the Portage tree:

root # porthole

Manage configuration changes after an emerge completes:

root # dispatch-conf

After installations / updates

Rebuilds packages that depend on an recently updated library:

root # revdep-rebuild

After updating Perl-core packages:

root # perl-cleaner --all

After updating python core packages:

root # python-updater

genlop

genlop is a portage log processor, also estimating build times when emerging packages.

root # man genlop

To view last 10 merges, run

root # genlop -l | tail -n 10

To view how long merging openoffice took

root # genlop -t openoffice

To estimate how much 'emerge -uU world' will take

root # emerge -pU world | genlop --pretend

Have a console watching the latest merging ebuild during upgrade

root # watch genlop -unc

USE flags

Obtain descriptions and usage of the USE flag X:

user $ euse -i X

Obtain a description of the png USE flag:

user $ euse -i | grep png

Show what packages have mysql use flag option:

user $ equery hasuse mysql

Show what use flags are available for a specific package:

user $ equery uses <package-name>

Quickly add a required USE flag for a package install

root # echo 'dev-util/cmake -qt4' >> /etc/portage/package.use

Typical Administration

Obtain root shell (if the current user is listed in the sudoers list):

user $ sudo -s

Start the ssh daemon in the default runlevel at boot:

root # rc-update add sshd default

Start the xdm service now:

root # rc-service xdm start

Check if the sshd service is running or not:

root # rc-status sshd

Important Files

  • /etc/portage/make.conf: Global settings (USE flags, compiler options)
  • /etc/portage/package.use: USE flags of individual packages
  • /etc/portage/package.accept_keywords: Keyword individual packages; e.g. ~amd64, ~x86, or ∼arm
  • /etc/portage/package.license: Accepted licenses
  • /var/lib/portage/world: List of explicitly installed package atoms
  • /var/db/pkg: Contains for every installed package a set of files about the installation

External resources