mf(1) on Linux
The text d51e44f06f77, as Debian 9 (Stretch) shipped it.
Metafont, a language for font and logo design
Flags it lists
-
-file-line-error -
-file-line-error-style -
-halt-on-error -
-help -
-ini -
-no-file-line-error -
-no-parse-first-line -
-parse-first-line -
-recorder -
-version