X resources

Also known as the file.

Introduction
X resources are configuration options for X applications such as the rxvt-unicode terminal emulator. They can also be used for setting the cursor theme. X resources can be set in. Most display managers will automatically load this configuration file on startup.

Syntax
Configuration options in the file should respect the following component syntax:

Examples of existing configuration options:

Comments
Comments start with an exclamation mark. For example:

Wildcards
It is possible to use  and   wildcards to apply a single rule to multiple configuration options. The  matches any single component. The  matches zero or more components. For example:

- Set the given value to all programs/classes which contain a component named background.

Constants
Constants can be defined in the following way:

(for example ).

External resources

 * Article on the Arch Linux wiki