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Re: Arithmetic expansion in rediretion word is evaluated twice


From: Chet Ramey
Subject: Re: Arithmetic expansion in rediretion word is evaluated twice
Date: Tue, 2 Jun 2020 10:09:06 -0400
User-agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.14; rv:68.0) Gecko/20100101 Thunderbird/68.8.1

On 6/1/20 3:34 PM, Oğuz wrote:
> See:
> 
>     $ unset foo
>     $ : <$((foo+=42))
>     bash: 84: No such file or directory
>     $ echo $foo
>     84

Yes. The redirection is evaluated once for the open and again for the
error message.

-- 
``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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