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Find all .gz files and recompress them to bz2 on the fly. No temp files.
edit: forgot the double quotes! jeez!
There is 1 alternative - vote for the best!
This solution is similar to  except that it does not have any dependency on GNU Parallel. Also, it tries to minimize the impact on the running system (using ionice and nice).
If you can do better, submit your command here.
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