bibtool(1) on Linux
The text e43c9ce963c2, as Debian 1.1 (Buzz) shipped it.
BibTeX file manipulation tool
Flags it lists
-
-$ -
-+ -
-- -
-Ac -
-K -
-M -
-O -
-S -
-X -
-f -
-h -
-i -
-k -
-m -
-o -
-q -
-r -
-s -
-v -
-x