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A package manager or package management system is a collection of software tools that automates the process of installing, upgrading, configuring, and removing computer programs for a computer's operating system in a consistent manner.
A package manager deals with packages, distributions of software and data in archive files.
Package metadata include package description, package version, and dependencies (other packages that need to be installed beforehand).
Package managers are charged with the task of finding, installing, maintaining or uninstalling software packages upon the user's command.
This kind of pre-configured installation is also supported by dpkg.For distributions based on and files as well as Slackware Linux, there is Check Install, and for recipe-based systems such as Gentoo Linux and hybrid systems such as Arch Linux, it is possible to write a recipe first, which then ensures that the package fits into the local package database.Particularly troublesome with software upgrades are upgrades of configuration files.Mobile operating systems such as Android (Linux-based), i OS (Unix-like) and Windows Phone rely almost exclusively on their respective vendors' app stores and thus use their own dedicated package management systems. It could be a file within the app's folder, or among the operating system's files and folders.At best, they may register themselves with an uninstallers list without exposing installation information.