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What's the best way to search my file system on ubuntu with instant results?

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linux-howto

http://askubuntu.com – What's the best way to search my file system on ubuntu and get results almost instantly? I have used catfish , tracker and the usual search tool provided with ubuntu. Tracker finds nothing, ubuntu search tool is too slow and catfish most of the time finds nothing. I have a lot of PDFs and DJVU files that I want to access. In windows, there is a program called search everything that returns results almost instantly. I want a similar linux tool. Please provide a detailed answer as possible as I'm a newbie in linux. If such a tool doesn't exist in ubuntu, what's the chance that I can find suc (HowTos)