Debian configuration system
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Template:Notatypo is a software utility for performing system-wide configuration tasks on Unix-like operating systems. It is developed for the Debian Linux distribution, and is closely integrated with Debian's package management system, dpkg.
When packages are being installed, Template:Notatypo asks the user questions which determine the contents of the system-wide configuration files associated with that package. After package installation, it is possible to go back and change the configuration of a package by using the dpkg-reconfigure program, or another program such as Synaptic.
The design of Template:Notatypo allows for front-ends for answering configuration questions to be added in a modular way, and there exist several, such as one for dialog, one for readline, one that uses a text editor, one for KDE, one for GNOME,[1] a Python front-end API, etc.
The original implementation of Template:Notatypo is in Perl. During the development of Debian-Installer, a new implementation in C was developed, which is named Template:Notatypo. The new implementation is currently only used in the installer, but is intended to eventually replace the original entirely. Both implementations make use of the same protocol for communication between the Template:Notatypo front-end and the client code ("Template:Notatypo"); this is a simple line-based protocol similar to common Internet protocols.
Template:Notatypo does not physically configure any packages, but asks the user certain configuration questions stored in the Template:Notatypo file, under the direction of the package's maintainer scripts (Template:Notatypo, Template:Notatypo, etc.). Typically, the Template:Notatypo script uses Template:Notatypo to ask questions, while Template:Notatypo applies configuration changes to the unpacked package in reaction to the answers; however, this can vary due to technical requirements. The user's answers to the configuration questions asked by Template:Notatypo are cached in Template:Notatypo's database.