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linux distributions

Linux / Unix: Generate A MD5 String

I need to generate a md5 hash for given string. It will be used by shell script to generate keys for remote web service or cryptographic application. How do I generate a md5 hash based on any input string under Linux or Unix like operating systems?
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If I recompile just the Linux kernel, do I have to recompile the whole entire applications/other files in my systems?
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MySQL: Log Files in Linux / UNIX / BSD

Can you tell me where are MySQL error and other log files are located under Linux / UNIX / BSD operating systems?
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What is Linux?

Can you explain me Linux? What is Linux? Is it a kernel or an operating systems?
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Q. How do I administer the printer configured under Linux file and printer server from a web browser?
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How To Select Best Linux Desktop Application

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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