indxbib(1) on Linux
The text 42e8a4c28953, as Debian 12 (Bookworm) shipped it.
make inverted index for bibliographic databases
Flags it lists
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-c -
-d -
-f -
-h -
-i -
-k -
-l -
-n -
-o -
-t -
-v -
-w