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Re: Error message garbage when parameter expansion used inside (()) and


From: Chet Ramey
Subject: Re: Error message garbage when parameter expansion used inside (()) and variable unset
Date: Wed, 4 Apr 2018 10:16:50 -0400
User-agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.12; rv:52.0) Gecko/20100101 Thunderbird/52.6.0

On 4/3/18 7:07 PM, PRussell wrote:
> Hi,
> 
> The error seems to be localized to the expansion of PS4 when "set -x" is 
> active.
> 
> Please see sample script below.

It's not quite that, though the expansion below does demonstrate what I
think is the problem.

If I am right about the cause, the problem (use-afer-free when printing an
error messasge) was fixed back in 11/2016 as a result of a series of
fuzzing scripts run through address sanitizer.

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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