CentOS 7.0 - man page for xkill (centos section 1)
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xkill - kill a client by its X resource
xkill [-display displayname] [-id resource] [-button number] [-frame] [-all]
Xkill 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 win-
dows on a user's screen. If no resource identifier is given with -id, xkill 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 window.
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, xkill will display a special cursor with
which you should select a window to be kill.
This option specifies the number of pointer button that should be used in select-
ing 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.
-all This option indicates that all clients with top-level windows on the screen should
be killed. Xkill will ask you to select the root window with each of the cur-
rently defined buttons to give you several chances to abort. Use of this option
is highly discouraged.
-frame This option indicates that xkill should ignore the standard conventions for find-
ing 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.
This command does not provide any warranty that the application whose connection to the X
server is closed will abort nicely, or even abort at all. All this command does is to
close the connection to the X server. Many existing applications do indeed abort when
their connection to the X server is closed, but some can choose to continue.
Button Specifies a specific pointer button number or the word "any" to use when selecting
X(7), xwininfo(1), XKillClient and XGetPointerMapping in the Xlib Programmers Manual,
KillClient in the X Protocol Specification
Jim Fulton, MIT X Consortium
Dana Chee, Bellcore
X Version 11 xkill 1.0.3 XKILL(1)
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