Because of non-standard formatting, the man page subjects are gone in apropos(1).
$ apropos diff|grep ^diff diff (1) - (unknown subject) diff (1posix) - compare two files diff3 (1) - (unknown subject) diffpp (1) - pretty-print diff outputs with GNU enscript difftime (3) - calculate time difference $ aptitude show diffutils Package: diffutils Version: 1:3.7-3
