xrdb:tldr:70331

The xrdb -query command is used to query the X resource database (Xrdb) settings on a Unix or Linux system.

Xrdb is a utility that manages the X11 server's resource database, which stores configuration settings for X applications. The X resource database uses a configuration file called ~/.Xresources by default, where you can set various X11 resources for applications to utilize.

The xrdb -query command is used to retrieve and display the current values of the X resources defined in the resource database. It essentially lists the resource names and their corresponding values that are currently set.

For example, if you have defined a resource called xterm.foreground in your ~/.Xresources file to set the color of the foreground text in an xterm window, running xrdb -query will display the current value assigned to that resource.

Note that X resources provide configuration options for X11 applications, and the behavior of the applications can be modified by altering these resources.