Ubuntu / Debian, etc. usando apt-get :
Primero debes correr update
, entonces upgrade
. Ninguno de ellos ejecuta automáticamente el otro.
apt-get update
actualiza la lista de paquetes disponibles y sus versiones, pero no instala ni actualiza ningún paquete.
apt-get upgrade
en realidad instala versiones más nuevas de los paquetes que tiene. Después de actualizar las listas, el administrador de paquetes conoce las actualizaciones disponibles para el software que ha instalado. Es por eso que primero quieres update
.
- Fuente .
Sin embargo, con Red Hat / CentOS usando yum, el update
comando le preguntará si desea aplicar las actualizaciones que encuentre.
$ sudo yum update
toma una lista de todas las actualizaciones disponibles y le pregunta si desea aplicarlas. Me gusta esto:
[..]
kf5-sonnet-core x86_64 5.33.0-1.el7 epel 150 k
kf5-sonnet-ui x86_64 5.33.0-1.el7 epel 141 k
Transaction Summary
==================================================================================================================================================
Upgrade 52 Packages
Total size: 15 M
Is this ok [y/d/N]:
Cuando su amigo se refiere a la actualización como "pequeños cambios" y a la actualización como "grandes cambios", en realidad significa la diferencia entre la actualización y dist-upgrade .
Del manual de apt-get:
upgrade
upgrade is used to install the newest versions of all packages
currently installed on the system from the sources enumerated in
/etc/apt/sources.list. Packages currently installed with new
versions available are retrieved and upgraded; under no
circumstances are currently installed packages removed, or packages
not already installed retrieved and installed. New versions of
currently installed packages that cannot be upgraded without
changing the install status of another package will be left at
their current version. An update must be performed first so that
apt-get knows that new versions of packages are available.
dist-upgrade
dist-upgrade in addition to performing the function of upgrade,
also intelligently handles changing dependencies with new versions
of packages; apt-get has a "smart" conflict resolution system, and
it will attempt to upgrade the most important packages at the
expense of less important ones if necessary. The dist-upgrade
command may therefore remove some packages. The
/etc/apt/sources.list file contains a list of locations from which
to retrieve desired package files. See also apt_preferences(5) for
a mechanism for overriding the general settings for individual
packages.