I've looked through various such tools, but none of them are to be used in Linux:
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KHTML2PNG does that for Linux, using the KHTML rendering engine. We're using it in headless mode on servers. | |||||||||||
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There is an Add-on for Firefox called Screengrab that places an icon in the browser status bar. Not command line, but either Linux or Windows, and handy. | |||
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We use wkhtml2pdf which is a static build of the Webkit rendering engine (as used by Safari, Chrome et al.) and generates a PDF. Not quite a JPEG/PNG screenshot, but it serves a different purpose for us. (As an added bonus, you can still copy the original text as-is.) It works on Linux, OS X and Windows. | |||
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ImageMagick which also works on Windows, Linux and Mac OSX can to this with the following command (code stolen from my Fluxbox menu)
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