Although made popular by Windows, INI files can be used on any system thanks to their flexibility. They allow a program to store configuration data, which can then be easily parsed and changed. Two notable systems that use the INI format are Samba and Trac. This is a native Ruby package for reading and writing INI files.
Gemfile gem 'inifile', '~> 0.1.0'
install gem install inifile -v 0.1.0