for D in *; do [ -d "${D}" ] && tar -cf - $D | xz -9 -c - > $D.tar.xz; done
Author: Malte
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Compress every folder in the current directory with strongest compression possible
for D in *; do [ -d "${D}" ] && tar -cf - $D | xz -9 -c - > $D.tar.xz; done