Command to concat all html together to be parsed:

echo "<root>" | cat > txt.xml && cat *.html >> txt.xml && echo "</root>" >> txt.xml

Image balise to add:

To compress: tar cvf archive.tar.xz --use-compress-program='xz -1T0' boop.csv

To uncompress: tar xvf archive.tar.xz --use-compress-program='xz -dT0'