GNU/Linux Desktop Survival Guide
by Graham Williams
An excellent solution is the Gnome Screenshot applet. This is run when
with DesktopTake Screenshot. It can also be run from the
command line to capture the window with current focus (after a 5
second delay) with:
$ gnome-panel-screenshot --window --delay 5
Under Gnome's Keyboard shortcuts the Print key will take a screenshot and Alt-Print will take a windowshot.