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In the X Window System, the program xwd (X Window dump) captures the content of a screen or of a window and optionally saves it into a file.[1]
xwd runs in one of two ways: if a user specifies the whole screen or the name or identifier of a window as an argument, the program captures the content of the window; otherwise, it changes the shape of the cursor and waits for the user to click in a window, whose content is then captured.
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Tyler, Chris (2008). X Power Tools. O'Reilly Series. O'Reilly Media, Inc. p. 107. ISBN 9780596101954. Retrieved 2014-01-23.
The X window dump (xwd) tool takes a snapshot of the current screen, a manually selected window or a window designated by its numeric ID, and outputs the image to standard output or to a file.