APT-GET(
APT-GET(
NAME
apt-get - APT package handling utility -- command-line interface
SYNOPSIS
apt-get [ -hvs ] [ -o=config string ] [ -c=file ] { update | upgrade |
dselect-upgrade | install pkg ... | remove pkg ... | source pkg ...
| build-dep pkg ... | check | clean | autoclean }
DESCRIPTION
apt-get is the command-line tool for handling packages, and may be con-
sidered the user’s "back-end" to other tools using the APT library.
Unless the -h, or --help option is given one of the commands below must
be present.
update update is used to resynchronize the package index files from
their sources. The indexes of available packages are fetched
from the location(s) specified in /etc/apt/sources.list. For
example, when using a Debian archive, this command retrieves and
scans the Packages.gz files, so that information about new and
updated packages is available. An update should always be per-
formed before an upgrade or dist-upgrade. Please be aware that
the overall progress meter will be incorrect as the size of the
package files cannot be known in advance.
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 circum-
stances 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 ver-
sions of packages; apt-get has a "smart" conflict resolution
system, and it will attempt to upgrade the most important pack-
ages at the expense of less important ones if necessary. The
/etc/apt/sources.list file contains a list of locations from
which to retrieve desired package files.
