3 command-line file conversion tools for Linux: 
Recently, a friend innocently asked me how many file formats there are. My semi-serious response was “Think of a soup bowl filled with beach sand.”
OK, there aren’t quite that many file formats. That said, you’ve probably never heard of many of the formats that are commonly-used enough to warrant listing on Wikipedia. Chances are, you’ll never see and never use most of them. If, however, you want or need to convert between file formats then there are a quite a few applications for the job.
read more: Opensource.com ScottNesbitt
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Have you tried: Farking?