When using a Subversion client, either from the command line or a graphical tool, there are a variety of things that you may want to configure to be true every time you run a Subversion command. To allow you to configure these options, Subversion maintains a few configuration files.
Configuration options can be set either on a per-user basis or as system-wide defaults (which will be used by every user on the system who hasn’t overridden them). Options are stored in configuration files—or in the case of Microsoft Windows, configuration files or registry entries.
On UNIX-based systems, such as Solaris, Linux, or Mac OS X, per-user configuration files are stored in the
.subversion directory ...