not sure if there are more than one mg(1), but, since you reference some BSD: $ uname -s; head -n 19 /usr/src/usr.bin/mg/README OpenBSD [This is a

not sure if there are more than one mg(1), but, since you reference some BSD: $ uname -s; head -n 19 /usr/src/usr.bin/mg/README OpenBSD [This is an edited version of the original mg README, updated slightly to reflect changes in the last 20 years.] Mg (mg) is a Public Domain EMACS style editor. It is "broadly" compatible with GNU Emacs, the latest creation of Richard M. Stallman, Chief GNUisance and inventor of Emacs. GNU Emacs (and other portions of GNU as they are released) are essentially free, (there are handling charges for obtaining it) and so is Mg. You may never have to learn another editor. (But probably will, at least long enough to port Mg...) Mg was formerly named MicroGnuEmacs, the name change was done at the request of Richard Stallman. Mg is not associated with the GNU project, and it does not have the copyright restrictions present in GNU Emacs. (However, some modules do have copyright notices.) The Mg authors individually may or may not agree with the opinions expressed by Richard Stallman in "The GNU Manifesto".