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CentOS 7.0 - man page for xev (centos section 1)

XEV(1)											   XEV(1)

       xev - print contents of X events

       xev   [-display	 displayname]	[-geometry   geom]  [-bw  pixels]  [-bs  {NotUseful,When-
       Mapped,Always}] [-id windowid] [-root] [-s] [-name string] [-rv]

       Xev creates a window and then asks the X server to send it events whenever  anything  hap-
       pens 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 devel-
       opment tool, and should not be needed in normal usage.

       -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

       -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.

       -root   This  option specifies that the root window should be monitored, instead of creat-
	       ing 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.

       -event event_mask
	       Select which events to display.	The -event option can be specified multiple times
	       to select multiple types of events.  When not specified, all events are	selected.
	       Available  event  masks:  keyboard  mouse expose visibility structure substructure
	       focus property colormap owner_grab_button randr

       X(7), xwininfo(1), xdpyinfo(1), Xlib Programmers Manual, X Protocol Specification
       See X(7) for a full statement of rights and permissions.

       Jim Fulton, MIT X Consortium

X Version 11				    xev 1.2.1					   XEV(1)

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