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Re: inconsistency with "readonly" and scope


From: Chet Ramey
Subject: Re: inconsistency with "readonly" and scope
Date: Sat, 14 Apr 2012 21:21:26 -0400
User-agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.6; rv:10.0.2) Gecko/20120216 Thunderbird/10.0.2

On 4/13/12 8:50 PM, Linda Walsh wrote:
> 
> 
> Chet Ramey wrote:
> 
>> This is intended.  Bash doesn't allow a local copy of a variable to
>> override a readonly global one.  This can be a potential security hole,
> 
> ---
> You can look at it that way, but it also hinders modular programming.
> 
> If I declare a variable to be local, I wouldn't expect it to fail and
> be overridden by some global namespace pollution.

If I declare a variable readonly at global scope, I wouldn't expect it
to be overridden by some local namespace pollution.

> It is overridable, but not easily.

Yes, it is.


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



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