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Re: misleading error message from variable modifier


From: Chet Ramey
Subject: Re: misleading error message from variable modifier
Date: Sat, 24 Feb 2018 14:24:21 -0500
User-agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.13; rv:52.0) Gecko/20100101 Thunderbird/52.5.2

On 2/23/18 10:20 PM, don fong wrote:
> hi folks.  i'm a bash user, who just noticed a slight anomaly.  it has
> to with the shell variable modifier ${parameter?} .  according to the
> man page, ${X?} should yield an error message and exit if X is unset,
> otherwise the value of X.  in this case,
> 
>     unset X; echo ${X?}
> 
> i expect to get an error message, and indeed an error message results.
> 
>     bash: X: parameter null or not set
> 
> but i think the error message is misleading.  

Thanks for the report and patch. I'll take a look.

Chet
-- 
``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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