* .Xdefaults

The syntax of an Xdefaults file is as follows:

  name.Class.resource: value

  name

                The name of the application, some program allow change it by

                '-name' option.

  class

                The classification used to group resources together. The names

                of classes conventionally start with an upper-case letter.

  resource

                The name of the resource whose value is to be changed.

                Resources are typically lowercase with uppercase

                concatenation.

  value

                The actual value of the resource. This can be 1 of 3 types:

                 * Integer (whole numbers).

                 * Boolean (true/false, yes/no, on/off).

                 * String, for example word (white), color (#ffffff), font

                   (-*-fixed-bold-r-*-*-*-100-*-*-*-*-iso8859-1 ) or path

                   (/usr/bin/firefox).

  delimiters

                A period (.) is used to signify each step down into the

                hierarchy. A colon (:) is used to separate the resource

                declaration from the actual value.

Comment start with '!' char and goes up to end of line or C-like /* */.

Use xprop utility to find classes and resources used by application.

To reread your .Xresources file, and throw away your old resources:

  $ xrdb ~/.Xdefaults

To reread your .Xresources file, and keep your old resources:

 $ xrdb -merge ~/.Xdefaults

**  Wildcard matching.

The asterisk can be used as a wildcard, making it easy to write a single rule

that can be applied to many different applications or elements.