Many times I see sudo dpkg-reconfigure foo. What is that? Seems to be configuration? But what is the relation between that and .conf file? Is there any file which stores this configuration?
If you need example:
sudo dpkg-reconfigure postfix
I need some more description what I know is just it is for package configuration.
Packages (like postfix) may install or generate configuration files (files that usually go in the /etc folder). During this process, there may be options that can be changed by the user. On installation, you are usually asked to set these options. In the case of postfix, it involves what type of server you're running, the hostname, and allowed IP addresses (among other things).
If you wanted to change those options afterwards, though, you can use dpkg-reconfigure which only goes through the configuration files phase of the package, where you can change those options.
Note that not all packages have user-configurable options, so even if a package installs a configuration file in /etc, dpkg-reconfigure might not do anything.
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