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I've looked through various such tools, but none of them are to be used in Linux:

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in the question you only mention Linux but in your comments below you ask for something that works on Windows. please clarify what platform you need this tool to run on. – quack quixote Apr 24 '10 at 10:41

KHTML2PNG does that for Linux, using the KHTML rendering engine. We're using it in headless mode on servers.

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Can it work in windows?Because I develop in windows. – user11671 Feb 6 '10 at 11:50
The title said you were searching for a Linux tool though... – ℝaphink Feb 6 '10 at 12:45
Yes,the build is on linux.But dev is on windows. – user11671 Feb 6 '10 at 17:47
@user11671: What? Rewrite your question to explain exactly what you are looking for. – CarlF Apr 28 '11 at 16:22

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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Screengrab also places an entry in your context menu so you can right-click in the browser and select screengrab. – John T Nov 24 '10 at 2:01

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)

import screenshot.jpg && display -resize 50% screenshot.jpg
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I get the following error: import.im6: unable to open X server ' @ error/import.c/ImportImageCommand/368.. Plus, where do you specify the URL? – starbeamrainbowlabs Nov 16 '14 at 20:26

Try wkhtmltoimage from wkhtmltopdf (check the downloads) Its great tool and ASAIK works on windows.

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There is an addon for firefox called Pearl Crescent that has command line access:

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