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When `read` is given a single character of input (including the
newline), it was bailing as if it had been given no input. This is
incorrect.
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The `--null` flag to `read` makes it split incoming lines on NUL instead
of newlines. This is intended for processing the output of a command
that uses NUL separators (such as `find -print0`).
Fixes #1694.
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Usage: read -n nchars
Reads maximum of nchars characters. If nchars <= 0, there's no limit.
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When $IFS is empty, command substitution no longer splits on newlines.
However we still want to trim off a single trailing newline, as most
commands will emit a trailing newline and it makes it harder to work
with their output.
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Enhance the `read` builtin to support creating an array with the --array
flag. With --array, only a single variable name is allowed and the
entire input is tokenized and placed into that variable as an array.
Also add custom behavior if IFS is empty or unset. In that event, split
the input on every character, instead of the previous behavior of doing
no splitting at all.
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Kevin Ballard
Joseph Tannhuber