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Re: Race in bash-4.3 'typeset'?


From: Chet Ramey
Subject: Re: Race in bash-4.3 'typeset'?
Date: Fri, 28 Oct 2016 10:00:26 -0400
User-agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.11; rv:45.0) Gecko/20100101 Thunderbird/45.4.0

On 10/25/16 4:09 PM, Stuart Shelton wrote:

> The cases appear, purely by inspection, to be:
> 
> Not declared: trivially, `typeset -p` doesn’t include the value;
> Declared (even as local) but unassigned: `typeset -p` includes "declare -- 
> varname";
> Declared and assigned: `typeset -p` includes "declare -- varname=‘value’”
> 
> … although how much of this is by design and how much by chance I’m not sure 
> ;)

It's all by design.  The idea is that you can use `typeset -p' to save and
restore the variable state.  It's imperfect, I'm sure, and there are
probably missing edge cases, but that's the idea.

-- 
``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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