Conary (package manager)
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Conary is a free software / open source package management system which focuses on installing packages through automated dependency resolution against distributed online repositories. It is used by Foresight Linux and rPath Linux.
Conary updates only those specific files in packages which need to be updated; this behavior minimizes bandwidth and time requirements for updating software packages. This Conary behavior is in contrast to other package management solutions, such as .rpm and .deb package formats, which download an entire package for every package being updated.