exim_db(8) on Linux

The text 81938ba6c29d, as Debian 12 (Bookworm), Debian 11 (Bullseye), Debian 10 (Buster), Debian 9 (Stretch), Debian 8 (Jessie) shipped it.

Exim's hint databases maintenance (exim_dumpdb, exim_fixdb, exim_tidydb)