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Re: [BUG] With null IFS, ${1+$*}, ${var-$*}, etc. don't generate fields


From: Chet Ramey
Subject: Re: [BUG] With null IFS, ${1+$*}, ${var-$*}, etc. don't generate fields
Date: Fri, 24 Feb 2017 16:28:40 -0500
User-agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.12; rv:45.0) Gecko/20100101 Thunderbird/45.7.1

On 2/24/17 4:07 PM, Chet Ramey wrote:
> On 2/24/17 3:20 PM, Grisha Levit wrote:
>>
>>
>> On Sat, Feb 18, 2017 at 8:35 PM, Martijn Dekker <address@hidden
>> <mailto:address@hidden>> wrote:
>>>
>>> When IFS is null, unquoted $* within an unquoted substitution (e.g.
>>> ${1+$*} or ${unset_var-$*}) joins the PPs together into one field, as if
>>> either "$*" or the whole substitution were quoted.
>>>
>>> POSIX says the unquoted substitution is supposed to generate one field
>>> for each positional parameter, with further field splitting inactive due
>>> to empty IFS.
> 
> If you want the expansion to be aware of the value of IFS and whether or
> field splitting will take place as a result, and I think that's the intent
> of the example, then the part of the description of $* that details what
> will happen when field splitting does not take place is active.  That's
> where it describes joining the positional parameters into a single string.

It might also be the case that, as I think I said in my original reply (?),
field splitting is just not one of the expansions that is performed on the
`word' in a ${paramOPword} expansion, and that is what determines the
expansion of $*.

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



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