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Re: RFE: request for quotes as grouping operators to work in brackets as

From: Chet Ramey
Subject: Re: RFE: request for quotes as grouping operators to work in brackets as elsewhere.
Date: Fri, 17 Sep 2010 22:31:05 -0400
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On 9/17/10 8:20 PM, Linda Walsh wrote:
> Andreas Schwab wrote:
>> Linda Walsh <address@hidden> writes:
>>>   Or another disparity:  C.
>>> t='one two three'
>>> c='one two three'
>>> 1) if [[ $t == $a ]]; then echo 'Matches'; fi
>>> 2) if [[ $t == "$a" ]]; then echo 'Matches'; fi
>>> So, the expressions match whether or not $a is in double quotes or not
>>> (single quotes would not match, as the $a would be taken literally).
>> Set a='one * three' and try again.
> ----   
>     Why?   How would that be any different than case B4 & B5 that I already
> showed?

I'm not sure you are understanding the difference between one case that
does not include any special pattern characters (what you're using with
==) and one that does (what you're using with =~).  Since the quoting
disables the special meaning of pattern characters, how can you claim
that your examples are equivalent?

>>> Quoting should not disable RE matching.

That's what you're asserting.  You're certainly entitled to do so.  Since
quoting does also disable pattern matching when using ==, however, you
can't use alleged inconsistency as an argument.

``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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