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| install
install is followed by one or more packages desired for installation or upgrading. Each package is a package name, not a
fully qualified filename (for instance, in a Debian system, apt-utils would be the argument provided, not
apt-utils_1.0.1ubuntu2_amd64.deb). All packages required by the package(s) specified for installation will also be
retrieved and installed. The /etc/apt/sources.list file is used to locate the desired packages. If a hyphen is appended to
the package name (with no intervening space), the identified package will be removed if it is installed. Similarly a plus
sign can be used to designate a package to install. These latter features may be used to override decisions made by
apt-get's conflict resolution system.
A specific version of a package can be selected for installation by following the package name with an equals and the
version of the package to select. This will cause that version to be located and selected for install. Alternatively a
specific distribution can be selected by following the package name with a slash and the version of the distribution or the
Archive name (stable, testing, unstable).
Both of the version selection mechanisms can downgrade packages and must be used with care.
This is also the target to use if you want to upgrade one or more already-installed packages without upgrading every
package you have on your system. Unlike the "upgrade" target, which installs the newest version of all currently installed
packages, "install" will install the newest version of only the package(s) specified. Simply provide the name of the
package(s) you wish to upgrade, and if a newer version is available, it (and its dependencies, as described above) will be
downloaded and installed.
Finally, the apt_preferences(5) mechanism allows you to create an alternative installation policy for individual packages.
If no package matches the given expression and the expression contains one of '.', '?' or '*' then it is assumed to be a
POSIX regular expression, and it is applied to all package names in the database. Any matches are then installed (or
removed). Note that matching is done by substring so 'lo.*' matches 'how-lo' and 'lowest'. If this is undesired, anchor the
regular expression with a '^' or '$' character, or create a more specific regular expression.
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