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Re: Not operator (~) fail on arithmetic expansion.


From: Chet Ramey
Subject: Re: Not operator (~) fail on arithmetic expansion.
Date: Mon, 28 Nov 2016 14:40:24 -0800
User-agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.11; rv:45.0) Gecko/20100101 Thunderbird/45.5.0

On 11/27/16 12:33 PM, Bize Ma wrote:

> Bash Version: 4.4 
> Patch Level: 5 
> Release Status: release 
> 
> Description: 
>   The ~ operator is called not, and does a one's complement of the
> following value. That works correctly with  
> 
>    $ echo $(( ~1 )) 
>    -2 
> 
> Even with 
> 
>    $ echo $(( ~0 )) 
>    -1 
> 
> But fails with this: 
> 
>    $ echo $((~0)) 
>    bash: /home/user: syntax error: operand expected (error token is
> "/home/user") 

Yes, this is a problem.  Thanks for the report.  I'll fix it in the
next devel branch push.  For the time being, you can include the
leading space to suppress the unwanted tilde expansion.

Chet
-- 
``The lyf so short, the craft so long to lerne.'' - Chaucer
                 ``Ars longa, vita brevis'' - Hippocrates
Chet Ramey, UTech, CWRU    address@hidden    http://cnswww.cns.cwru.edu/~chet/



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