indxbib(1) on Linux
The text 3b28f15369ad, as Debian 11 (Bullseye) shipped it.
make inverted index for bibliographic databases
Flags it lists
-
-c -
-d -
-f -
-h -
-i -
-k -
-l -
-n -
-o -
-t -
-v -
-w