xdpyinfo

xdpyinfo is a command-line utility for the X Window System that displays information about the X server, including details about the screen, keyboard, and mouse. It is part of the xorg-x11-apps package, which is commonly available on Linux and other Unix-like operating systems.

When executed without any arguments, xdpyinfo will print a comprehensive report to the standard output. This report typically includes the X server version, protocol version, vendor, and the default screen number. For each screen available, it provides resolution, color depth, available visual types, and information about supported extensions. It also details the keyboard's key mapping, modifier keys, and mouse button mapping.

The output of xdpyinfo is useful for system administrators and developers who need to understand the capabilities and configuration of an X display. It can help in diagnosing display-related issues, verifying hardware support, or determining the compatibility of certain applications. The information provided is static and reflects the current state of the X server at the time of execution. While xdpyinfo provides a snapshot, it does not offer real-time monitoring or dynamic configuration capabilities.