In the above resource, Label specifies any instance of the widget class Label . It is usually more convenient to set the resources for an entire class of widgets than for an individual instance, as you typically want to make the entire application look consistent. Several times, you've been told to add or modify a resource. The X distribution provides several programs you can use to add, modify, and view resources. Most well-behaved X programs accept the xrm command line option for adding or modifying a single resource.
X provides considerably more sophisticated mechanisms to modify and examine resources.
The most simple of these is xrdb . Xrdb is a command line utility that can load, query, and merge resources. Replaces any resources currently in the database with new values if they are specified in the file. Nothing currently in the resource database that is encountered in the file will be loaded. Show the resource database that is currently in use.