Exits with a non-zero status if there were any processing errors. Having no fonts present counts as a processing error.
If there is at least one font present, then missing fonts
will be replaced by the first cmr10 font it
finds, or a more-or-less randomly chosen alternative if that
font is not used at all. The program will produce a warning
if the -q option is not present, but it will
return with a zero (success) status.
Exception: If the -n option (see Section 2.1) is present, then the program returns
success only if all fonts are present.