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Re: Inconsistent quote and escape handling in substitution part of param


From: Chet Ramey
Subject: Re: Inconsistent quote and escape handling in substitution part of parameter expansions.
Date: Tue, 28 Feb 2012 17:15:29 -0500
User-agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.7; rv:8.0) Gecko/20111105 Thunderbird/8.0

On 2/28/12 5:07 PM, Chet Ramey wrote:

>> yhea but I think the point is that the current behavior is useless.
>> there is no case where I want a " to be printed and start a double
>> quoted string? and thats the current behavior.
>>
>>
>> Not so important how you treat it just need to pick 1. then you can at
>> least work with it. Now you have to use a temp variable.
>>
>>
>> as a side note ksh93 is pretty good, intuitive
>> ksh93 -c 'test=teststrtest ; echo "${test//str/"dd dd"}"'
>> testdd ddtest
>> ksh93 -c '( test=teststrtest ; echo ${test//str/"dd '\''dd"} )'
>> testdd 'ddtest
> 
> The real question is whether or not you do quote removal on the stuff
> inside the braces when they're enclosed in double quotes.  Double
> quotes usually inhibit quote removal.
> 
> The Posix "solution" to this is to require quote removal if a quote
> character (backslash, single quote, double quote) is used to escape
> or quote another character.  Somewhere I have the reference to the
> Austin group discussion on this.

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

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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