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Re: command substitution inside parameter expansion inside "for ((;;))"

From: Chet Ramey
Subject: Re: command substitution inside parameter expansion inside "for ((;;))"
Date: Wed, 15 Nov 2017 11:37:36 -0500
User-agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.12; rv:52.0) Gecko/20100101 Thunderbird/52.4.0

On 11/15/17 5:13 AM, Stephane Chazelas wrote:

> I also noticed that cmd was not run in ${x#`cmd`} if x happens
> to be empty (it's also the case in dash and ksh93 though only if
> x is unset; zsh, mksh and yash are fine)

It looks like bash/dash/ksh93 give more weight to the "If word is not
needed, it shall not be expanded" part of the standard; more than the
"The word shall be expanded to produce a pattern" text in the description
of the pattern removal word expansions.

``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/

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