Not sure whether this is a known issue. Ksh93t+ (on Linux).
Both, read -n 1 and read -N 1 do not return after a character
has been read. The code
while read -n 1 xyz ; do echo "$xyz" ; done
seems not to work properly with ksh93t+ if read gets its input
from stdin - prepending a pipe works fine, though -, but that
worked well in former versions, e.g. with ksh93r+.
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