hxindex(1) on Linux
The text 383b0717766d, as Debian 13 (Trixie), Debian 12 (Bookworm), Debian 11 (Bullseye), Debian 10 (Buster) shipped it.
insert an index into an HTML document
Flags it lists
-
-N -
-O -
-X -
-c -
-f -
-n -
-r -
-t -
-x