extract layers from an inkscape svg into separate svg files.
sed 's/ / \n/g' $SVG | # REPLACE ALL SPACES WITH A LINEBREAK
sed '/^.$/d' | # REMOVE ALL EMPTY LINES
sed -n '/<\/metadata>/,/<\/svg>/p' | sed '1d;$d' | # PRINT SECTION BETWEEN </metadata> AND </svg> (EXCLUSIVE)
sed ':a;N;$!ba;s/\n/ /g' | # REMOVE ALL LINEBREAKS
sed 's/<\/g>/\n<\/g>/g' | # ADD LINEBREAK BEFORE GROUP END </g>
sed 's/\(<g.*inkscape:group[^>]*>\)/QWERTZUIOP\1/g' | # ADD PLACEHOLDER BEFORE <g ... > CONTAINING GROUPMODE PATTERN
sed ':a;N;$!ba;s/\n/ /g' | # REMOVE ALL LINEBREAKS
sed 's/QWERTZUIOP/\n\n\n\n/g' | \ # REPLACE PREVIOUSLY SUBSTITUTED PLACEHOLDER WITH NEWLINES
sed 's/display:none/display:inline/g' # MAKE HIDDEN LAYERS VISIBLE