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From: ziyunfei <446240525@qq.com>
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Subject: Re: \? is missing in "3.1.2.4 ANSI-C Quoting" in Bash Reference Manual
Date: Fri, 4 Sep 2015 05:17:17 +0800
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On Sep 4, 2015, at 3:07 AM, Chet Ramey <chet.ramey@case.edu> wrote:

> I guess I see what you're saying: that bash removes the backslash quoting
> the `?' when processing $'...' but leaves backslashes escaping other
> characters not listed in the description of $'...' unchanged.  I can add
> that to the documentation.
> 
> If that's not what you mean, I guess I don't understand.  `printf %b'
> expands one set of backslash escapes, and $'...' expands a slightly
> different set, since they're trying to serve slightly different purposes
> and have different origins.  They're separate constructs and are documented
> separately.

Yes, that's what I mean. Thanks for clarifying!