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Re: [Help-bash] Arithmetic evaluation / expansion question

From: Chet Ramey
Subject: Re: [Help-bash] Arithmetic evaluation / expansion question
Date: Thu, 11 Oct 2018 10:36:34 -0400
User-agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.13; rv:52.0) Gecko/20100101 Thunderbird/52.9.1 
On 10/10/18 1:25 PM, Andy Chu wrote:
> Right, I have seen this very odd recursive behavior.  It doesn't appear to
> be documented, but one of the very first bugs filed against OSH mentions it:

"Within an expression, shell
 variables may also be referenced by name without  using  the  parameter
 expansion  syntax"

and

"The  value  of a variable is evaluated as an arithmetic expression when
 it is referenced"

-- 
``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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