If you don't want to install any special programs, xwd(1) which comes with X 
is pretty good.  Its output is an X Window Dump (xwd).  You can convert an X 
Window Dump to a PNG with ImageMagick's convert(1) program.  You can pipeline 
the two commands together, but here is a simple two step example.
UNIX>  xwd -root > display.xwd
UNIX>  convert display.xwd display.png

If you need something a bit more flashy, GIMP seems to be the most popular.

Brian

On Friday 09 March 2007 9:51 am, Sean wrote:
> Is anyone able to recommend an app to take a desktop screen
> shot?
> Not one tied to any specific desktop environment.
>
>                       Thanks
>                       Sean

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