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Re: inconsistent treatment of backslash-bang

From: Lawrence D'Oliveiro
Subject: Re: inconsistent treatment of backslash-bang
Date: Fri, 18 Jul 2008 17:35:51 +1200
User-agent: Microsoft-Outlook-Express-Macintosh-Edition/5.0.6

Chet Ramey wrote:

> Here's the deal.  Only single quotes and backslashes quote the history
> expansion character.  Double quotes don't matter ...

Then why do they cause a difference in behaviour?

> Since ! is not one of the characters for which Posix says the backslash
> will act as an escape, the rest of the word expansions leave it alone.

Then why does “\!” act as “!” under any circumstances at all?

> This is explained pretty well in the HISTORY EXPANSION section of the
> manual page.

Do you mean this sentence from section 9.3: “Only ‘\’ and ‘'’ may be used to
escape the history expansion character”. How exactly does that explain why
there is a difference inside versus outside double-quotes?

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