From: Jonathan Nieder <jrnieder@gmail.com>
Date: Mon, 20 Jun 2011 11:04:41 GMT
Subject: Re: POSIX woes in t7810.87: dash bash or bash dash?
Message-ID: <20110620110440.GA29270@elie>
In-Reply-To: <4DFF19C4.5070003@drmicha.warpmail.net>

Hi Michael,

Michael J Gruber wrote:

> echo "a\"b\n\"c"
> a"b
> "c
>
> t7810.87 breaks with dash because of this. Escaping the \n does not make
> the test work with both either.

This seems to have slipped by because testing it requires USE_LIBPCRE
to be set.  Thanks for catching it.

> So I'd like to know which one's right
> and (independently) how to make it work for both...

Both are right.  The simplest fix is to use printf, as in

	printf "%s\n" "a\"b\n\"c"

See [1] and [2].

Regards,
Jonathan

[1] http://www.gnu.org/s/hello/manual/autoconf/Limitations-of-Builtins.html#echo
[2] http://pubs.opengroup.org/onlinepubs/9699919799/utilities/echo.html