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


From: John Kearney
Subject: Re: Inconsistent quote and escape handling in substitution part of parameter expansions.
Date: Tue, 28 Feb 2012 19:13:54 +0100
User-agent: Mozilla/5.0 (X11; Linux i686; rv:10.0) Gecko/20120129 Thunderbird/10.0

On 02/28/2012 07:00 PM, Dan Douglas wrote:
> On Tuesday, February 28, 2012 06:52:13 PM John Kearney wrote:
>> On 02/28/2012 06:43 PM, Dan Douglas wrote:
>>> On Tuesday, February 28, 2012 06:38:22 PM John Kearney wrote:
>>>> On 02/28/2012 06:31 PM, Dan Douglas wrote:
>>>>> On Tuesday, February 28, 2012 05:53:32 PM Roman Rakus
>>>>> wrote:
>>>>>> On 02/28/2012 05:49 PM, Greg Wooledge wrote:
>>>>>>> On Tue, Feb 28, 2012 at 05:36:47PM +0100, Roman Rakus
>>>>>>> 
>>>>>>> wrote:
>>>>>>>> And that means, there isn't way to substitute
>>>>>>>> "something" to ' (single quote) when you want to not
>>>>>>>> perform word splitting. I would consider it as a
>>>>>>>> bug.
>>>>>>> 
>>>>>>> imadev:~$ q=\' imadev:~$ input="foosomethingbar"
>>>>>>> imadev:~$ echo "${input//something/$q}" foo'bar
>>>>>> 
>>>>>> I meant without temporary variable.
>>>>>> 
>>>>>> RR
>>>>> 
>>>>> address@hidden ~ $ ( x=abc; echo ${x/b/$'\''} ) a'c
>>>> 
>>>> ( x=abc; echo "${x/b/$'\''}" ) -bash: bad substitution: no 
>>>> closing `}' in "${x/b/'}"
>>>> 
>>>> 
>>>> you forgot the double quotes ;)
>>>> 
>>>> 
>>>> I really did spend like an hour or 2 one day trying to figure
>>>> it out and gave up.
>>> 
>>> Hm good catch. Thought there might be a new quoting context
>>> over there.
>> 
>> I think we can all agree its inconsistent, just not so sure we
>> care?????? i.e. we know workarounds that aren't so bad variables
>> etc.
> 
> Eh, it's sort of consistent. e.g. this doesn't work either:
> 
> unset x; echo "${x:-$'\''}"
> 
> and likewise a backslash escape alone won't do the trick. I'd
> assume this applies to just about every expansion.
> 
> I didn't think too hard before posting that. :)


My favorite type of bug one thats consistently inconsistent :)




now that I have a beter idea of what weird I'll take a look later after
the gym.



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