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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 17:44:38 -0500 |
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Mozilla/5.0 (Macintosh; Intel Mac OS X 10.7; rv:8.0) Gecko/20111105 Thunderbird/8.0 |
On 2/28/12 5:30 PM, Maarten Billemont wrote:
>>> 1${A:-B}2
>>>
>>> Logically for consistancy having double quotes at position 1 and 2
>>> should have no effect on how you treat string B.
>>
>> Maybe, but that's not how things work in practice. Should the following
>> expansions output the same thing? What should they output?
>>
>> bar=abc
>> echo ${foo:-'$bar'}
>> echo "${foo:-'$bar'}"
>>
>> Chet
>
>
> Personally, I'd prefer it to behave in the same way bash deals with this sort
> of thing in other contexts.
You'd be surprised.
> Eg.
>
> echo $(echo '$bar')
> echo "$(echo '$bar')"
>
> Both obviously result in <$bar> getting output.
New-style command substitutions are treated differently.
> For the sake of consistency with the rest of bash, I would expect the same
> from your example.=
No shell behaves like that. Everyone outputs
$bar
'abc'
and Posix requires it.
--
``The lyf so short, the craft so long to lerne.'' - Chaucer
``Ars longa, vita brevis'' - Hippocrates
Chet Ramey, ITS, CWRU chet@case.edu http://cnswww.cns.cwru.edu/~chet/
- Re: Inconsistent quote and escape handling in substitution part of parameter expansions., (continued)
- Re: Inconsistent quote and escape handling in substitution part of parameter expansions., Steven W. Orr, 2012/02/28
- Re: Inconsistent quote and escape handling in substitution part of parameter expansions., John Kearney, 2012/02/28
- Re: Inconsistent quote and escape handling in substitution part of parameter expansions., Chet Ramey, 2012/02/28
- Re: Inconsistent quote and escape handling in substitution part of parameter expansions., John Kearney, 2012/02/28
- Re: Inconsistent quote and escape handling in substitution part of parameter expansions., Chet Ramey, 2012/02/28
- Re: Inconsistent quote and escape handling in substitution part of parameter expansions., Chet Ramey, 2012/02/28
- Re: Inconsistent quote and escape handling in substitution part of parameter expansions., John Kearney, 2012/02/28
- Re: Inconsistent quote and escape handling in substitution part of parameter expansions., John Kearney, 2012/02/28
- Re: Inconsistent quote and escape handling in substitution part of parameter expansions., Chet Ramey, 2012/02/28
- Re: Inconsistent quote and escape handling in substitution part of parameter expansions., Maarten Billemont, 2012/02/28
- Re: Inconsistent quote and escape handling in substitution part of parameter expansions.,
Chet Ramey <=
- Re: Inconsistent quote and escape handling in substitution part of parameter expansions., John Kearney, 2012/02/28
- Re: Inconsistent quote and escape handling in substitution part of parameter expansions., Chet Ramey, 2012/02/28
- Re: Inconsistent quote and escape handling in substitution part of parameter expansions., John Kearney, 2012/02/28
- Re: Inconsistent quote and escape handling in substitution part of parameter expansions., Chet Ramey, 2012/02/29
- Re: Inconsistent quote and escape handling in substitution part of parameter expansions., John Kearney, 2012/02/28
- Re: Inconsistent quote and escape handling in substitution part of parameter expansions., Chet Ramey, 2012/02/29
- Re: Inconsistent quote and escape handling in substitution part of parameter expansions., John Kearney, 2012/02/29
- Re: Inconsistent quote and escape handling in substitution part of parameter expansions., Chet Ramey, 2012/02/29
- Re: Inconsistent quote and escape handling in substitution part of parameter expansions., Eric Blake, 2012/02/29
- Re: Inconsistent quote and escape handling in substitution part of parameter expansions., Eric Blake, 2012/02/28