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xdpyinfo(1) [centos man page]

XDPYINFO(1)						      General Commands Manual						       XDPYINFO(1)

xdpyinfo - display information utility for X SYNOPSIS
xdpyinfo [-display displayname] [-queryExtensions] [-ext extension-name] [-version] DESCRIPTION
Xdpyinfo is a utility for displaying information about an X server. It is used to examine the capabilities of a server, the predefined values for various parameters used in communicating between clients and the server, and the different types of screens and visuals that are available. By default, numeric information (opcode, base event, base error) about protocol extensions is not displayed. This information can be obtained with the -queryExtensions option. Use of this option on servers that dynamically load extensions will likely cause all possible extensions to be loaded, which can be slow and can consume significant server resources. Detailed information about a particular extension is displayed with the -ext extensionName option. If extensionName is all, information about all extensions supported by both xdpyinfo and the server is displayed. If -version is specified, xdpyinfo prints its version and exits, without contacting the X server. ENVIRONMENT
DISPLAY To get the default host, display number, and screen. SEE ALSO
X(7), xprop(1), xrdb(1), xwininfo(1), xrandr(1), xdriinfo(1), xvinfo(1), glxinfo(1) AUTHOR
Jim Fulton, MIT X Consortium Support for the XFree86-VidModeExtension, XFree86-DGA, XFree86-Misc, and XKB extensions added by Joe Moss X Version 11 xdpyinfo 1.3.1 XDPYINFO(1)

Check Out this Related Man Page

XEV(1)							      General Commands Manual							    XEV(1)

xev - print contents of X events SYNOPSIS
xev [-display displayname] [-geometry geom] [-bw pixels] [-bs {NotUseful,WhenMapped,Always}] [-id windowid] [-s] [-name string] [-rv] DESCRIPTION
Xev creates a window and then asks the X server to send it events whenever anything happens to the window (such as it being moved, resized, typed in, clicked in, etc.). You can also attach it to an existing window. It is useful for seeing what causes events to occur and to display the information that they contain; it is essentially a debugging and development tool, and should not be needed in normal usage. OPTIONS
-display display This option specifies the X server to contact. -geometry geom This option specifies the size and/or location of the window, if a window is to be created. -bw pixels This option specifies the border width for the window. -bs {NotUseful,WhenMapped,Always} This option specifies what kind of backing store to give the window. The default is NotUseful. Backing store refers to the the pixels saved off-screen when the X server maintains the contents of a window; NotUseful means that the xev process will redraw its contents itself, as necessary. -id windowid This option specifies that the window with the given id should be monitored, instead of creating a new window. -s This option specifies that save-unders should be enabled on the window. Save unders are similar to backing store, but they refer rather to the saving of pixels off-screen when the current window obscures other windows. Save unders are only advisory, and are normally set for popup dialogs and other transient windows. -name string This option specifies the name to assign to the created window. -rv This option specifies that the window should be in reverse video. SEE ALSO
X(7), xwininfo(1), xdpyinfo(1), Xlib Programmers Manual, X Protocol Specification See X(7) for a full statement of rights and permissions. AUTHOR
Jim Fulton, MIT X Consortium X Version 11 xev 1.0.4 XEV(1)

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