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Re: unexpected tilde quoting change in version 4.3


From: Chet Ramey
Subject: Re: unexpected tilde quoting change in version 4.3
Date: Thu, 23 Oct 2014 10:05:08 -0400
User-agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.9; rv:24.0) Gecko/20100101 Thunderbird/24.6.0

On 10/22/14, 4:08 PM, address@hidden wrote:
> Bash Version: 4.2 and 4.3
> 
> Description:
> 
> I find this change in quoting from 4.2 to 4.3 odd, where double-quoted
> "~" used to be quoted (no expansion) and no longer works:

This just came up yesterday, for pete's sake:

http://lists.gnu.org/archive/html/bug-bash/2014-10/msg00197.html

A longer explanation, with links to older bug reports:

http://lists.gnu.org/archive/html/bug-bash/2014-03/msg00038.html

The Posix interpretation that prompted the behavior change came in 2010:

http://austingroupbugs.net/view.php?id=221

The current version of Posix says this about the substring removal word
expansions, which use patterns in the same way as pattern substitution:

"Enclosing the full parameter expansion string in double-quotes shall not
cause the following four varieties of pattern characters to be quoted,
whereas quoting characters within the braces shall have this effect."

Chet
-- 
``The lyf so short, the craft so long to lerne.'' - Chaucer
                 ``Ars longa, vita brevis'' - Hippocrates
Chet Ramey, ITS, CWRU    address@hidden    http://cnswww.cns.cwru.edu/~chet/



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