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I came across the unoconv linux utility for converting document formats. I found that unoconv produces different output everytime it is called with same input file.

bash$ unoconv -f doc test.html
bash$ md5sum test.doc
bash$ rm test.doc
bash$ unoconv -f doc test.html
bash$ md5sum test.doc

How to overcome this behaviour?

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You could diff the results to see what is causing the difference - my guess is a timestamp. Wordprocessor documents can contain functions and fields that are evaluated when "published".

$ unoconv -f doc test1.html
$ unoconv -f doc test2.html
$ diff test1.htm test2.html
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