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       xev - print contents of X events


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


       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


       -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


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


       Jim Fulton, MIT X Consortium