xev

XEV(1)                      General Commands Manual                     XEV(1)

NAME
       xev - print contents of X events

SYNOPSIS
       xev  [-display displayname] [-geometry geom] [-bw pixels] [-bs {NotUse-
       ful,WhenMapped,Always}] [-id  windowid]  [-root]  [-s]  [-name  string]
       [-rv] [-version] [-event event_mask [-event event_mask ...]]

DESCRIPTION
       Xev creates a window and then asks the X server to send it events when-
       ever 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 debug-
       ging 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.

       -root   This option specifies that the root window 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  re-
               fer  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 win-
               dows.

       -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 spec-
               ified 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 button

       -version
               This option prints the program version and exits.

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 1.2.3                            XEV(1)