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Re: Should [[ -v 1 ]] be supported?


From: Chet Ramey
Subject: Re: Should [[ -v 1 ]] be supported?
Date: Fri, 28 Dec 2018 18:19:01 -0600
User-agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.14; rv:60.0) Gecko/20100101 Thunderbird/60.3.3

On 12/27/18 3:11 PM, Martijn Dekker wrote:

> Consistency might be a better argument. If [[ -v foo ]] is equivalent to [[
> -n ${foo+s} ]] for variables (with the advantage that you don't need 'eval'
> to handle arbitrary values of 'foo'), then perhaps it's not unreasonable to
> expect [[ -v 1 ]] to be equivalent to [[ -n ${1+s} ]].

The completeness argument is more rigorous, and there's a case to add this
in a future version of bash. He didn't make that argument, though.

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



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