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tmpf=$TMPDIR/tmp-$$
printf "%s\n" "one two three four" > $tmpf
# make sure we rewind the input properly when reading a specific number of
# characters or using a non-standard delimiter from a regular file
exec <$tmpf
read -n 4 input && echo "$input"
cat -
exec <$tmpf
read -d ' ' input && echo "$input"
cat -
rm -f $tmpf
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