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/usr/share/texmf-texlive/metafont/misc/ztest.mf is in texlive-base 2009-15.

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% try all characters on TEST.MF using the parameters of an unknown font
if unknown cmbase: input cmbase fi % omit if CMMF can be assumed
mode_setup;

def generate suffix t= enddef;
input z; font_setup;

let echar=endchar;
def endchar= echar; stop "done with char "&decimal charcode&". " enddef;
let iff=always_iff;

input test;
end