* tests/autotest.at (BSx641-newline in command):

* tests/autotest.at (BSx641-newline in command):
(BS-BS-newline in command, BSx640-newline in command):
(Newline-CODE-BS-newline in command):
(Single-quote-BS-newline in command):
(Single-quote-newline-BS-newline in command):
Use printf '%s\n' instead of echo, for portability to hosts
where echo interprets backslashes.  This will break on hosts
that lack printf, but for now let's assume all such hosts
are dead (if not, we should get reports of test failures).