Resizing windows to a particular width and height instantly

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http://askubuntu.com – For some reason, I wish to resize a window to a very large size, 4-5 times larger than my screen size. For now, I am doing it manually by moving the entire window but one corner out of the screen and then pulling the corner to expand the window. However, this is very time taking. Is there some way to resize the window to a particular height and width instantly ? (perhaps from commandline or with the help of some small app or something else) (HowTos)