Linux / UNIX File Formats

I‘ve followed your guide and installed denyhosts to protect on my RedHat 5.3 OpenSSH based server. However, I’ve been accidentally blocked out from my home ADSL IP address. I tried removing my blocked IP from /etc/hosts.deny, but it did blocked it again quickly. It appears that DenyHosts keeps track of the attempts somewhere on disk or memory. How do I remove my own home IP address from DenyHosts?

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Q. How do I render font smoothly in Ubuntu Linux / Gnome desktop systems? How do I get look a likes of the Microsoft / Mac OS X smooth fonts for Firefox and other applications?

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Q. I know how to find out information about compiled driver under FreeBSD kernel. But, how do I find out if a Particular feature, driver or filesystem support is compiled into my running Linux kernel or not? How do I find out if DMA support is compiled into my kernel?

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Q. I’m new to GNU/Linux world and a single query (apt-cache search office or yum search ‘office’) shows so many application for a single task such as network monitoring or office applications. The number of apps choices just confusing. How do you select application from so many choices?

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Q. How do I extract images from a PDF file under Linux / UNIX shell account?

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Q. I can append text to a file using >> operator but how do I prepend a text to a file? I want the opposit of >> operation?

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