apt-cache
puede mostrar gran parte de la información almacenada en la base de datos interna de APT. Esta información es una especie de caché, ya que se obtiene de las diferentes fuentes definidas en el archivo sources.list
. Esto ocurre durante la operación apt update
.
apt-cache
command can do keyword-based package searches with apt-cache search keyword
. It can also display the headers of the package's available versions with apt-cache show package
. This command provides the package's description, its dependencies, the name of its maintainer, etc. Note that apt search
, apt show
, aptitude search
, and aptitude show
work in the same way.
apt-cache dumpavail
displays the headers of all available versions of all packages. apt-cache pkgnames
displays the list of all the packages which appear at least once in the cache.
apt-cache policy
, described in the following section.
apt-cache policy
command displays the pinning priorities and distribution properties of each package source as explained in Sección 6.2.5, “Gestión de prioridades de los paquetes”. It can also show the pinning priorities for all available versions and sources of a package. For the sources.list
example used in Ejemplo 6.2, “el archivo /etc/apt/sources.list
para usuarios de Debian «stable»” and APT::Default-Release
set to "/^bookworm(|-security|-updates)$/"
, the output will look like this:
$
apt-cache policy
Package files: 100 /var/lib/dpkg/status release a=now 990 http://deb.debian.org/debian bookworm-updates/non-free-firmware amd64 Packages release v=12-updates,o=Debian,a=stable-updates,n=bookworm-updates,l=Debian,c=non-free-firmware,b=amd64 origin deb.debian.org 990 http://deb.debian.org/debian bookworm-updates/main amd64 Packages release v=12-updates,o=Debian,a=stable-updates,n=bookworm-updates,l=Debian,c=main,b=amd64 origin deb.debian.org 990 http://security.debian.org/debian-security bookworm-security/non-free-firmware amd64 Packages release v=12,o=Debian,a=stable-security,n=bookworm-security,l=Debian-Security,c=non-free-firmware,b=amd64 origin security.debian.org 990 http://security.debian.org/debian-security bookworm-security/main amd64 Packages release v=12,o=Debian,a=stable-security,n=bookworm-security,l=Debian-Security,c=main,b=amd64 origin security.debian.org 990 http://deb.debian.org/debian bookworm/non-free-firmware amd64 Packages release v=12.5,o=Debian,a=stable,n=bookworm,l=Debian,c=non-free-firmware,b=amd64 origin deb.debian.org 990 http://deb.debian.org/debian bookworm/main amd64 Packages release v=12.5,o=Debian,a=stable,n=bookworm,l=Debian,c=main,b=amd64 origin deb.debian.org Pinned packages:
apt-cache policy
también puede mostrar las propiedades de pinning para todas las versiones y fuentes disponibles de un paquete determinado.
$
apt-cache policy adb
adb: Installed: 1:29.0.6-28 Candidate: 1:29.0.6-28 Version table: 1:33.0.3-2~bpo12+1 100 100 http://deb.debian.org/debian bookworm-backports/main amd64 Packages *** 1:29.0.6-28 990 990 http://deb.debian.org/debian bookworm/main amd64 Packages 100 /var/lib/dpkg/status
bookworm-backports
repository, APT will not install it automatically based on the priority. One would have to use apt install adb/bookworm-backports
or add a higher pinning priority to /etc/apt/preferences.d/adb.pref
:
Package: adb Pin: release o=Debian Backports,n=bookworm-backports Pin-Priority: 1001
$
apt-cache policy limnoria
adb: Installed: 1:29.0.6-28 Candidate: 1:33.0.3-2~bpo12+1 Version table: 1:33.0.3-2~bpo12+1 1001 100 http://deb.debian.org/debian bookworm-backports/main amd64 Packages *** 1:29.0.6-28 990 990 http://deb.debian.org/debian bookworm/main amd64 Packages 100 /var/lib/dpkg/status