From: Chet Ramey <chet.ramey@case.edu>
To: Sebastian Gniazdowski <psprint@zdharma.org>,
Peter Stephenson <p.stephenson@samsung.com>,
zsh-users@zsh.org
Cc: chet.ramey@case.edu
Subject: Re: How to substitute empty array element, or empty string
Date: Sat, 25 Mar 2017 14:59:23 -0400 [thread overview]
Message-ID: <815fd7bd-5c0d-72c5-d264-aede1a3a0322@case.edu> (raw)
In-Reply-To: <etPan.58d60c4f.6b8b4567.17199@MacMini.local>
On 3/25/17 2:21 AM, Sebastian Gniazdowski wrote:
> On 24 marca 2017 at 12:50:43, Peter Stephenson (p.stephenson@samsung.com) wrote:
>> [[ '' = * ]] && echo yes
>>
>> echoes "yes" in bash as well as zsh, so "*" can match an empty string,
>> and I don't think the / and // operators are standardised.
>
> Checked that in ksh:
>
> % a=""; echo ${a//*/x}
> x
> % a=( "" ); echo ${a[@]//*/x}
> x
> % [[ "" = * ]] && echo yes
> yes
>
> It can look like // behavior was bash-driven, and in bash there is the omission for "".
This was changed between bash-4.3 and bash-4.4.
--
``The lyf so short, the craft so long to lerne.'' - Chaucer
``Ars longa, vita brevis'' - Hippocrates
Chet Ramey, UTech, CWRU chet@case.edu http://cnswww.cns.cwru.edu/~chet/
prev parent reply other threads:[~2017-03-25 19:09 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <CGME20170322075332epcas3p4a32050e48ad0f94be13134b560f17715@epcas3p4.samsung.com>
2017-03-22 7:52 ` Sebastian Gniazdowski
2017-03-22 9:52 ` Peter Stephenson
2017-03-24 11:26 ` Sebastian Gniazdowski
2017-03-24 11:49 ` Peter Stephenson
2017-03-25 6:21 ` Sebastian Gniazdowski
2017-03-25 18:59 ` Chet Ramey [this message]
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