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