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Groups > gnu.bash.bug > #14992

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

From Chet Ramey <chet.ramey@case.edu>
Newsgroups gnu.bash.bug
Subject Re: Should [[ -v 1 ]] be supported?
Date 2018-12-28 18:19 -0600
Organization ITS, Case Western Reserve University
Message-ID <mailman.6485.1546043022.1284.bug-bash@gnu.org> (permalink)
References <CABrM6wmrn2gi8_HgmRg67B5nsgGNFRn8Bn-r20MvC-_2LJHZ0g@mail.gmail.com> <5dac2cf2-2fac-0fd1-058f-6a84a3271738@case.edu> <abd86dbc-f6e2-62bd-e9dc-f959e2dbff9f@inlv.org>

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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    chet@case.edu    http://tiswww.cwru.edu/~chet/

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Re: Should [[ -v 1 ]] be supported? Chet Ramey <chet.ramey@case.edu> - 2018-12-28 18:19 -0600

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