Updating apt get repositories

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The user can specify packages by POSIX regular expression.APT searches its cached list of packages and lists the dependencies that must be installed or updated.This allows administrators to ensure that packages are not upgraded to versions which may conflict with other packages on the system, or that have not been sufficiently tested for unwelcome changes.In order to do this, the pins in APT's preferences file ( APT front-ends can list the dependencies of packages being installed or upgraded, ask the administrator if packages recommended or suggested by newly installed packages should be installed too, automatically install dependencies and perform other operations on the system such as removing obsolete files and packages.Another such distinction is remote repository retrieval of packages.

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Much of the original development of APT was done on IRC, so records have been lost.APT retrieves, configures and installs the dependencies automatically. Usage modes of apt and apt-get that facilitate updating installed packages include: APT relies on the concept of repositories in order to find software and resolve dependencies.For apt, a repository is a directory containing packages along with an index file.The APT name was eventually decided after considerable internal and public discussion.Ultimately the name was proposed on IRC, accepted and then finalized on the mailing lists.

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