Follow-up Comment #12, bug #62357 (project groff):
Aha. macOS *is out of conformance with POSIX*! <thunder, rage>
-c
[XSI] Interpret bytes as characters specified by the current setting of
the LC_CTYPE category. Certain non-graphic characters appear as C escapes:
"NUL=\0", "BS=\b", "FF=\f", "NL=\n", "CR=\r", "HT=\t"; others appear as
3-digit octal numbers.
https://pubs.opengroup.org/onlinepubs/9699919799/utilities/od.html
"... *others appear as 3-digit octal numbers* "
But since I don't expect Apple to ever change this--they're Apple--I guess
I'll have to go with the "od -b" approach.
(Incidentally, I said in comment #11 that GNU coreutils od output "spaces" for
non-printable characters. That was incorrect, as my own sample output showed.
My eyes had apparently glazed over.)
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