xkill - kill a client by its X resource
xkill [-display displayname] [-id resource] [-button number] [-frame] [-all]
This option specifies the name of the X server to contact.
This option specifies the X identifier for the resource whose
creator is to be aborted. If no resource is specified,
will display a special cursor with which you should select a window to be
This option specifies the number of pointer button that should
be used in selecting a window to kill. If the word "any" is specified, any
button on the pointer may be used. By default, the first button in the pointer
map (which is usually the leftmost button) is used.
This option indicates that all clients with top-level windows
on the screen should be killed.
will ask you to
select the root window with each of the currently defined buttons to give
you several chances to abort. Use of this option is highly discouraged.
This option indicates that
ignore the standard conventions for finding top-level client windows (which
are typically nested inside a window manager window), and simply believe that
you want to kill direct children of the root.
command is a utility for forcing the X
server to close connections to clients. This program is very dangerous, but
is useful for aborting programs that have displayed undesired windows on a
user's screen. If no resource identifier is given with
will display a special cursor as a prompt for the user to
select a window to be killed. If a pointer button is pressed over a non-root
window, the server will close its connection to the client that created the
Specifies a specific pointer button number or the word "any"
to use when selecting windows.
Xlib Programmers Manual,
X Protocol Specification
Jim Fulton, MIT X Consortium Dana Chee, Bellcore