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- recompresses all gz files to bz2 files from this point and below in the directory tree
- output shows the size of the original file, and the size of the new file. Useful.
- conceptually easier to understand than playing tricks with awk and sed.
- don't like output? Use the following line:
for gz in `find . -type f -name '*.gz' -print`; do f=`basename $gz .gz` && d=`dirname $gz` && gunzip -c $gz | bzip2 - -c > $d/$f.bz2 && rm -f $gz ; done
Find all .gz files and recompress them to bz2 on the fly. No temp files.
edit: forgot the double quotes! jeez!
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).
Part of the "atool" package.
Part of the "atool" package
the -a flag causes tar to automatically pick the right compressor to filter the archive through, based on the file extension. e.g.
"tar -xaf archive.tar.xz" is equivalent to "tar -xJf archive.tar.xz"
"tar -xaf archive.tar.gz" is equivalent to "tar -xzf archive.tar.gz"
No need to remember -z is gzip, -j is bzip2, -Z is .Z, -J is xz, and so on :)