abc2abc(1) on Linux
The text 04bfa3a763bd, as Debian 2.2 (Potato), Debian 2.1 (Slink), Debian 2.0 (Hamm) shipped it.
a simple abc checker/re-formatter/transposer
Flags it lists
-
-b -
-e -
-n -
-r -
-s -
-u