Install locate command

To install locate on your gentoo : emerge sys-apps/mlocate
Then make updatedb

chroot : Enter in a new environment

chroot is a unix command which permits to change root dir.

It permit to enter in a new environment in your terminal.So you can add an other system just in other window.For example, I launch my experimental gentoo in a terminal and I make a chroot. My terminal is similar to that : (chroot) localhost / #
The major advantage is I can compile and make update easily without having restart my computer.


Here is how you can do to enter in a new environment :

1) Mount experimental partition (depends on your system):
mount /dev/sda6 /mnt/gentoo

2) Mount /proc and /dev

Mount file system /proc in /mnt/gentoo/proc permit at the installation to use information provide by the kernel.Same things for /dev.

mount -t proc none /mnt/gentoo/proc
mount -o bind /dev /mnt/gentoo/dev

3) Enter in a new environment :

You can do it in three steps.First you change the root directory by making a chroot.Then you create the environment variable whit env-update.And to finish, you load this variable in memory wy using source.

chroot /mnt/gentoo /bin/bash
env-update
source /etc/profile
export PS1="(chroot) $PS1"

Search ebuild faster with eix

Problem :

You can search ebuild with emerge -s.Is there a faster way to search packet ?

Solution :

It exists a tool to make search faster on portage tree and other non official trees : eix

0) Install it :

  $ echo app-portage/eix >> /etc/portage/package.keywords
    $ emerge -av app-portage/eix

1) Update it (you have to do this after emerge --sync) : update-eix
2) Search a packet (for example mediawiki) : eix -s mediawiki

equery

Definition : Equery is a package query tool.

Installation :

# emerge gentoolkit

USE :

Here is some common use about equery :

- List all installed package : equery l

$ equery l
ou
$ equery list

The output of the command is : [---] [--] package.

The first bracket can have these values :
I : installed package
P : Portage
O : Overlay

The second bracket can have these value :
~ : by keywords.
- : by arch
M : masqued


Example :
$ equery l
[ Searching for all packages in all categories among: ]
* installed packages
[I--] [ ] app-admin/eselect-1.1.3 (0)
[I--] [M ] app-admin/eselect-ctags-1.5 (0)
...

- List all dependency of a packet : equery depends [packet]

$ equery depends vim
[ Searching for packages depending on vim... ]
app-vim/gentoo-syntax-20070506 (>=app-editors/vim-7.0)
virtual/editor-0 (app-editors/vim)


- Search at which packet belongs this file : equery b [fichier]

# equery belongs /usr/bin/audacious
ou
# equery b /usr/bin/audacious

For more informations, you can see the official gentoo documentation : gentoolkit

eselect

In this article i will present that we can do with the eselect command.

Definition : eselect is a command to configure and administrate gentoo system.It can be use for example to switch kernel or java version.You have to use this command carrefully.

Installation : It's possible that you need to install before use.To install :

$ echo app-admin/eselect ~x86 >> /etc/portage/package.keywords
$ emerge -av app-admin/eselect

Common use : List possible selection and set one of them
eselect list

Example:
# eselect java-vm list
Available Java Virtual Machines:
[1] sun-jdk-1.5
[2] sun-jdk-1.6 system-vm

# eselect kernel list
Available kernel symlink targets:
[1] linux-2.6.26-gentoo-r3
[2] linux-2.6.27-gentoo-r4
[3] linux-2.6.27-gentoo-r5
[4] linux-2.6.27-gentoo-r7
[5] linux-2.6.28-gentoo
[6] linux-2.6.28-gentoo-r1
[7] linux-2.6.29-gentoo-r2
[8] linux-2.6.29-gentoo-r4
[9] linux-2.6.30-gentoo-r1 *

Set a selection :

# eselect kernel set 1
# eselect kernel set linux-2.6.27-gentoo-r7

Activate fonction to a module :

You can for example activate or disable vim for bash completion.

Example :
$ eselect bashcomp enable vim



http://www.gentoo.org/proj/en/eselect/index.xml